Perhaps you should try some spelling variations:
luu hanh » huu han
ve triet » va trien, su triet
tu sach » thu sach, su sach, te sach
ly nang » ky nang, ly hang, ly vang
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
luu van » cuu van, luan van
y nang » ky nang, v nang, may 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 ((y nang) OR (ly nang)) xa hoi. hieu vu cham ((luu van) or (luu hanh)) hanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ly nang)) xa hoi. hieu vu cham ((luu van) OR (luu hanh)) hanh vi ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (ly nang)) xa hoi. hieu vu cham ((luu van) or (luu hanh)) hanh vi ve triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) OR (ly nang)) xa hoi. hieu vu cham ((luu van) or (luu hanh)) hanh vi ve triet*.