Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
hanh vai » hanh vi, hanh va, hanh tai
cua viet » ca viet, hoa viet, cua dieu
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, dam thuc
va hanh » van hanh, va thanh, va danh

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 ma hoa. hieu ve ((cam tuc) or (nam thuc)) va hanh vai ((cua viet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ma hoa. hieu ve ((cam tuc) OR (nam thuc)) va hanh vai ((cua viet) OR (cua vat)).
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ma hoa. hieu ve ((cam tuc) or (nam thuc)) va hanh vai ((cua viet) or (cua vat))*.