Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
hanh dai » hanh tai, hanh dao, vanh dai
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
sanh thu » sach thu, san thu, doanh thu
so sanh » do sanh
tang ma » tang van
hieu ve » hieu van
hieu va » lieu va, hieu qua
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: so sanh thu ((mang may) or (tang ma)) hoi. ((hieu ve) or (hieu va)) pham thuc van hanh dai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh thu ((mang may) OR (tang ma)) hoi. ((hieu ve) OR (hieu va)) pham thuc van hanh dai cua tu.
• Adding a wildcard symbol may retrieve word variants: so sanh thu ((mang may) or (tang ma)) hoi. ((hieu ve) or (hieu va)) pham thuc van hanh dai cua tu*.