Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
hanh ki » hanh vi, hanh ky, hanh kien
xuc van » duc van, luc van, vuc van
su sach » so sach, vu sach
dai hoi » dai hoc, dai hai, dai moi
vu dang » su dang, vu quang, cua dang
vu nang » vuc nang, va nang, v nang
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: su sach ((vu nang) or (vu dang)) dai 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: su sach ((vu nang) OR (vu dang)) dai 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: "su sach ((vu nang) or (vu dang)) dai hoi. ((hieu va) OR (hieu qua)) cam xuc van hanh ki su triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((vu nang) or (vu dang)) dai hoi. ((hieu va) OR (hieu qua)) cam xuc van hanh ki su triet*.