Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
pham thuc » phap thuc, pham chuc, nham thuc
vat hanh » vat thanh, van hanh, va hanh
hanh dai » hanh tai, hanh dao, vanh dai
sach ky » sac ky, sach y, sach ty
doi hoi » doi thoi, doi voi, doi moi
hoi hoi » hoi hoc, hoc hoi, hoi doi
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
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: thuoc sach ky nang ((doi hoi) or (hoi hoi)). hieu va pham thuc vat hanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky nang ((doi hoi) OR (hoi hoi)). hieu va pham thuc vat hanh dai cua te.
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky nang ((doi hoi) or (hoi hoi)). hieu va pham thuc vat hanh dai cua te*.