Perhaps you should try some spelling variations:
su triet » su tien, ve triet
van hanh » van thanh, ban hanh, van anh
nang mai » nang ma, nang tai, lang mai
tu sach » thu sach, su sach, tu cach
hanh ki » hanh vi, hanh ky, hanh kien
xuc van » duc van, luc van, vuc van
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
vu nang » vuc nang, va nang, vu dang
te sach » toc sach
su viet » so viet
va cam » va cham, va cac, va cao

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