Perhaps you should try some spelling variations:
nang tao » nang cao, sang tao, nang tai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
tao hoi » tao khoi, tao boi, tay hoi
hieu ve » hieu va, hieu van
ca viet » va viet, co viet, hoa viet
tuc va » thuc va, truc va, duc va
vi ca » vit ca, li ca, va ca

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 tao hoi. ((hieu ve) or (lieu va)) cam ((tuc va) or (tuc xa)) hanh vi ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang tao hoi. ((hieu ve) OR (lieu va)) cam ((tuc va) OR (tuc xa)) hanh vi ca viet.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang tao hoi. ((hieu ve) or (lieu va)) cam ((tuc va) or (tuc xa)) hanh vi ca viet*.