Perhaps you should try some spelling variations:
phap thuc » phap thu, phap hoc, phap tu
tham thuc » nham thuc, pham thuc, tam thuc
nang cau » nang cao, hang cau, nang dau
pham thu » pham thuc, pham thi, pham tu
vanh dai » van dai, vanh tai, lanh dao
su sach » so sach, vu sach
cau hoa » cau hoi
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
va vanh » va van, va danh, va hanh
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: su sach ky nang cau hoa. hieu ve ((tham thuc) or (((pham thu) or (phap thuc)))) va vanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang cau hoa. hieu ve ((tham thuc) OR (((pham thu) OR (phap thuc)))) va vanh dai cua te.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang cau hoa. hieu ve ((tham thuc) or (((pham thu) or (phap thuc)))) va vanh dai cua te*.