Perhaps you should try some spelling variations:
nang cai » nang cao, nang tai, nang cap
ban hanh » ban hang
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cai hoi » cau hoi, dai hoi, cai hoa
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
va danh » va dinh, va dan, va hanh
va cam » va cham, va cac, va cao
vai su » va su, van su, lai su

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. hieu va cam luc ((ban hanh) or (va danh)) vai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang cai hoi. hieu va cam luc ((ban hanh) OR (va danh)) vai su triet.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang cai hoi. hieu va cam luc ((ban hanh) or (va danh)) vai su triet*.