Perhaps you should try some spelling variations:
kho tang » cao tang
sach kho » bach khoa, sach dao, sach nha
cac truc » cau truc, cac tru, cac trung
so sach » so sanh, bo sach, co sach
truc va » thuc va, thuc vat, trung va
tang ma » mang may, tang van
hieu ve » hieu van
hieu va » lieu va, hieu qua
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach kho tang ma hoi. ((hieu ve) or (hieu va)) cac truc va ((gan vi) or (doan va)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach kho tang ma hoi. ((hieu ve) OR (hieu va)) cac truc va ((gan vi) OR (doan va)) cua te.
• Adding a wildcard symbol may retrieve word variants: so sach kho tang ma hoi. ((hieu ve) or (hieu va)) cac truc va ((gan vi) or (doan va)) cua te*.