Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
van bac » van ban, van bao, van hac
bac tuc » bac tu, bach tuoc, bac thua
thai xu » thai cua
y nang » ky nang, ly nang, v nang
va dao » ca dao

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 van bac tuc ((va dau) OR (va dao)) ((thai xu) or (tai cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu van bac tuc ((va dau) OR (va dao)) ((thai xu) OR (tai cuc)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. hieu van bac tuc ((va dau) OR (va dao)) ((thai xu) or (tai cuc)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu van bac tuc ((va dau) OR (va dao)) ((thai xu) or (tai cuc)) tre*.