Perhaps you should try some spelling variations:
thien van » thi van
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
thue va » thuc va, thuyet va, thuc vat
va hanh » van hanh, va thanh, va danh
cua tuc » cua duc, cua thuoc, luat tuc
y nang » ky nang, ly nang, v nang
cua tu » cua su, cua cu, cua te

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 va) or (thien van)) luat thue va hanh vi ((cua tu) OR (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. ((hieu va) OR (thien van)) luat thue va hanh vi ((cua tu) OR (cua tuc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. ((hieu va) or (thien van)) luat thue va hanh vi ((cua tu) OR (cua tuc))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. ((hieu va) or (thien van)) luat thue va hanh vi ((cua tu) OR (cua tuc))*.