Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van luat » dan luat, va luat, van xuat
luat tuc » luat thue
tu sach » thu sach, su sach, te sach
hanh di » hanh vi, hanh de, danh di
hang di » hang doi, hang vi, hang dien
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cua duc » cua tuc, cua nuoc, cua quoc
tuc va » thuc va, truc va, tuc xa
cua tu » cua tuc, cua su, cua cu

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