Perhaps you should try some spelling variations:
sach thuc » cach thuc, sach thu, sach thue
ban thanh » ban hanh, ban hang
hoc sach » hoc sinh, hoc cac, hoc anh
thuc van » thuc vat, thuc dan, thuc va
cau phoi » cau hoi, cap phoi, cay phoi
ve triet » va trien, su triet
van cau » van dau, van hau, van chat
hieu ve » hieu va, hieu van
cam cuc » cam xuc, cham cuu, pham cuc
cuc ban » cua ban, cac ban, cuu ban
san ve » ban ve, san va, dan ve

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 thuc van cau phoi. ((hieu ve) or (hieu qua)) cam cuc ban thanh san ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach thuc van cau phoi. ((hieu ve) OR (hieu qua)) cam cuc ban thanh san ve triet.
• Adding a wildcard symbol may retrieve word variants: hoc sach thuc van cau phoi. ((hieu ve) or (hieu qua)) cam cuc ban thanh san ve triet*.