Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
luat tuc » luat thue
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
cua tuc » cua duc, cua thuoc, cua nuoc
y nang » ky nang, ly nang, v nang
tuc va » thuc va, truc va, tuc xa
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 van) or (thien van)) luat tuc va hanh vi ((cua tuc) OR (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. ((hieu van) OR (thien van)) luat tuc va hanh vi ((cua tuc) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. ((hieu van) or (thien van)) luat tuc va hanh vi ((cua tuc) OR (cua tu))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. ((hieu van) or (thien van)) luat tuc va hanh vi ((cua tuc) OR (cua tu))*.