Perhaps you should try some spelling variations:
ve triet » va trien, su triet
chat lua » chat cua, chat va, chat huu
sach ly » sach y, sach lo, sach ty
hanh gi » danh gia, hanh noi, hanh tai
lua van » luan van, luu van, qua van
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
hieu vu » hieu va, hieu su, dieu vu
nang xa » nang x, lang xa, nang ma
ly nang » ky nang, ly hang, ly vang

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