Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
su triet » su viet, su tien, ve triet
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
hanh ve » hanh va, hanh kem
tuc va » thuc va, truc va, tuc xa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang xa hoi. ((hieu van) OR (hieu va)) cam tuc va ((hanh ve) or (hanh vi)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. ((hieu van) OR (hieu va)) cam tuc va ((hanh ve) OR (hanh vi)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. ((hieu van) OR (hieu va)) cam tuc va ((hanh ve) or (hanh vi)) su triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. ((hieu van) OR (hieu va)) cam tuc va ((hanh ve) or (hanh vi)) su triet*.