Perhaps you should try some spelling variations:
toan tai » toan tap, doanh tai, toan ban
so sanh » do sanh
sanh ty » sach ty, canh tay
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
ve cham » ve chat, vu cham, ve chim
va cham » va chat, va tham
truc va » thuc va, thuc vat, trung va
va toan » van toan, bai toan, tap toan
tai va » thai va, mai va, tri va
thiet » thieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh ty nang xa hoi. hieu ((ve cham) or (va cham)) truc va toan tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ty nang xa hoi. hieu ((ve cham) OR (va cham)) truc va toan tai va thiet.
• Adding a wildcard symbol may retrieve word variants: so sanh ty nang xa hoi. hieu ((ve cham) or (va cham)) truc va toan tai va thiet*.