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
nang xa » nang x, lang xa, nang ma
hieu vu » hieu va, hieu su, dieu vu
hieu ve » hieu va, hieu van
luu van » cuu van, luan van
y nang » ky nang, ly nang, v 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 xa hoi. ((hieu vu) OR (hieu ve)) 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 xa hoi. ((hieu vu) OR (hieu ve)) 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 xa hoi. ((hieu vu) OR (hieu ve)) cham ((luu van) or (luu hanh)) hanh vi ve triet".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. ((hieu vu) OR (hieu ve)) cham ((luu van) or (luu hanh)) hanh vi ve triet*.