Perhaps you should try some spelling variations:
su triet » su viet, su tien
ve triet » va trien
van hanh » van thanh, ban hanh, van anh
chat lua » chat cua, chat va, chat huu
sach ly » sach y, sach lo, sach ty
lua van » luan van, luu van, qua van
tu sach » thu sach, su sach, te sach
hieu su » hieu sau, tieu su, hieu so
hieu ve » hieu va, hieu van
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 ve) or (hieu su)) chat lua van hanh vi ((ve triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly nang xa hoi. ((hieu ve) OR (hieu su)) chat lua van hanh vi ((ve triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ly nang xa hoi. ((hieu ve) or (hieu su)) chat lua van hanh vi ((ve triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ly nang xa hoi. ((hieu ve) or (hieu su)) chat lua van hanh vi ((ve triet) OR (su triet))*.