Perhaps you should try some spelling variations:
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
nang mai » nang ma, nang tai, lang mai
su triet » su tien, ve triet
su sach » so sach, vu sach
sach vu » sach va, sach tu, sach uu
qua cam » qua cham, qua cac, qua ca
mai hoi » mai khoi, dai hoi, lai hoi
vu nang » vuc nang, va nang, vu dang
su viet » so viet

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach vu nang mai hoi. hieu qua cam xuc ((van hanh) OR (ban hanh)) ki ((su triet) OR (su viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach vu nang mai hoi. hieu qua cam xuc ((van hanh) OR (ban hanh)) ki ((su triet) or (su viet))~".
• Adding a wildcard symbol may retrieve word variants: su sach vu nang mai hoi. hieu qua cam xuc ((van hanh) OR (ban hanh)) ki ((su triet) or (su viet))*.