Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
hieu van » thien van, lieu va, hieu ve
hanh hai » thanh hai, nhanh hai, hang hai
vat hanh » vat thanh, van hanh, va hanh
sach thu » sach thue, sach thieu, sach tham
hieu va » lieu va, hieu qua
hai cua » thai cua, dai cua, hoi cua
bo sach » co sach, hoc sach
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
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: bo sach thu ((nang ma) or (sang ma)) hoi. ((hieu van) or (hieu va)) pham thuc vat hanh hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach thu ((nang ma) OR (sang ma)) hoi. ((hieu van) OR (hieu va)) pham thuc vat hanh hai cua te.
• Adding a wildcard symbol may retrieve word variants: bo sach thu ((nang ma) or (sang ma)) hoi. ((hieu van) or (hieu va)) pham thuc vat hanh hai cua te*.