The duo joined Varsha Sanjeev and two-time bronze medallist Vidya Pillai, who had qualified yesterday.
Chandra blanked Spain's Francisco Rodriguez 4-0 in his last league match to top the six-player group with five wins.
Sanchis, though, lost her final league match to China's Chunxia Shi 0-3 but the 23-year-old joined her other countrymates in the knock-out phase after finishing second in her group with five wins.
In her previous outing, Sanchis had beaten The Netherlands' Manon Melief 3-0.
Neena Praveen failed to make the cut even after defeating Jana Mitova of Bulgaria 3-0 for her fourth win in six matches. Neena finished third in her group.
Varshaa also came up triumphant in her league match against Ukraine's Maria Buckaraska, beating her 3-0.
In the masters section (above 40), S A Saleem bowed out of the competition after losing 2-3 to Ian Sergeant from Wales. Nigel Lazar, too, lost to Murat Ayas 1-3.
Results:
Shahbaaz Adil Khan lost Brenden O'Donoghue (Ireland): (2-4) 72-50 16-68 88-6 56-25 33-61 71-15.
Brijesh Damani lost Roman Dietzel (Germany): (2-4) 70-41, 5-82, 64-69 61-49 69-44 65-31.
Women's: Neena Praveen bt Yana Shut (Belerus): (3-0) 64-47 66-38 58-18.
Arantxa Sanchis lost Chunxia Shi (Hong Kong): (0-3) 49-68 36-74 44-65.
Neena Praveen bt Irina Gorbataya (Russia): (3-1) 55-13 56-43 39-70 81-58.
Masters: Nigel Lazer lost Murat Ayas: (3-1) 75-24 62-48 33-55 60-53.
S A Saleem lost Ian Sergeant (Wales): (3-2) 51-74 27-65 63-62 0-97 0-97.
