Perhaps you should try some spelling variations:
sach dat » sach danh, sach bai, sach xa
van hanh » van thanh, ban hanh, van anh
sach dao » lanh dao
su viet » so viet
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
su tien » su kien, su hien, tu tieng
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach dat) or (sach dao)) nang ma hoi. hieu va cac xuc van hanh vi ((su viet) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach dat) OR (sach dao)) nang ma hoi. hieu va cac xuc van hanh vi ((su viet) OR (su tien)).
• Adding a wildcard symbol may retrieve word variants: tu ((sach dat) or (sach dao)) nang ma hoi. hieu va cac xuc van hanh vi ((su viet) or (su tien))*.