Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
cua dang » cua cong, cua ban
hanh ki » hanh vi, hanh ky, hanh kien
xuc van » duc van, luc van, vuc van
tu sach » thu sach, su sach, te sach
mai hoi » mai khoi, dai hoi, lai hoi
vu dang » su dang, vu quang
hieu va » lieu va
ki su » ky su

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