Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
pham thuc » pham chuc, nham thuc, pham thu
phap thuc » phap thu, phap hoc, phap tu
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
hanh de » hanh ve, hanh kem
de cua » le cua, te cua, dieu cua
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: thuat sach ky nang cao hoi. hieu ve ((pham thuc) or (phap thuc)) va hanh de cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang cao hoi. hieu ve ((pham thuc) OR (phap thuc)) va hanh de cua tu.
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang cao hoi. hieu ve ((pham thuc) or (phap thuc)) va hanh de cua tu*.