Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
cai hoi » dai hoi, cai hoa, lai hoi
cua tre » cuu tre, cua triet, dua tren
hieu ke » hieu kem, chieu ke, hieu ky
sach ky » sac ky, sach y, sach ty
cau luc » cau truc, cau phuc
ke cau » ket cau
luc va » duc va, tuc va, loc va
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 ((cai hoi) or (cau hoi)). hieu ke cau luc va hanh lai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((cai hoi) OR (cau hoi)). hieu ke cau luc va hanh lai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((cai hoi) or (cau hoi)). hieu ke cau luc va hanh lai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((cai hoi) or (cau hoi)). hieu ke cau luc va hanh lai ((cua tre) OR (cua te))*.