Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
tinh ven » trinh ven, tinh yen, sinh vien
tinh ve » trinh ve, dinh ve, tinh va
hieu va » lieu va, hieu qua
tu sach » thu sach, te sach, tu cach
nang ho » nang hoc, nang co, tang ho
su sach » so sach, vu sach
cac xuc » cam xuc, cac nuoc, chat xuc
ho hoi » hoc hoi, hoa hoi, hoi hoi
xuc va » duc va, tuc va, luc va

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 (su sach)) ky nang ho hoi. hieu va cac xuc va ((tinh ve) OR (tinh ven)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang ho hoi. hieu va cac xuc va ((tinh ve) OR (tinh ven)) va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang ho hoi. hieu va cac xuc va ((tinh ve) OR (tinh ven)) va triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang ho hoi. hieu va cac xuc va ((tinh ve) OR (tinh ven)) va triet*.