Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
thai cuu » thai cua, tai cuc, thai xu
te sach » toc sach
thi cuc » tai cuc
cac tuc » cac toc, cac tu, cac tac
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
tuc va » thuc va, truc va, tuc xa
va dan » ca dan, va dao, va dau

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 (thien van)) cac tuc va dan ((thai cuu) or (thi cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. ((hieu van) OR (thien van)) cac tuc va dan ((thai cuu) OR (thi cuc)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. ((hieu van) OR (thien van)) cac tuc va dan ((thai cuu) or (thi cuc)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. ((hieu van) OR (thien van)) cac tuc va dan ((thai cuu) or (thi cuc)) tre*.