Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
thanh ve » hanh ve, thanh va, thanh vien
thanh vi » hanh vi, thanh va, nhanh vi
dua ban » dia ban, cua ban, qua ban
cay dua » chay dua, cay lua, ca dua
qua cay » cua cay, qua cac, qua ca
xang ca » hang ca, tang ca, dang ca
so sanh » do sanh
ca hoi » cau hoi, cua hoi, xa hoi
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc sach) or (so sanh)) ty xang ca hoi. hieu qua cay dua ban ((thanh vi) or (thanh ve)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (so sanh)) ty xang ca hoi. hieu qua cay dua ban ((thanh vi) OR (thanh ve)) cua tu.
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (so sanh)) ty xang ca hoi. hieu qua cay dua ban ((thanh vi) or (thanh ve)) cua tu*.