Perhaps you should try some spelling variations:
ve triet » va trien, su triet
van hanh » van thanh, ban hanh, van anh
hoc sach » hoc sinh, hoc cac, hoc anh
soc van » hoc van, oc van, sac van
va cham » va chat, va tham
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, te sach
vu nang » vuc nang, va nang, vu dang
v nang » va nang, van nang, voi nang
vi ve » va ve, gi ve, ve ve

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 (hoc sach)) ((v nang) OR (vu nang)) xa hoi. hieu va cham soc van hanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (hoc sach)) ((v nang) OR (vu nang)) xa hoi. hieu va cham soc van hanh vi ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (hoc sach)) ((v nang) OR (vu nang)) xa hoi. hieu va cham soc van hanh vi ve triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (hoc sach)) ((v nang) OR (vu nang)) xa hoi. hieu va cham soc van hanh vi ve triet*.