Perhaps you should try some spelling variations:
hieu dac » hieu cac, bieu dac, chieu day
dac luat » dan luat, dap luat, cac luat
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
hanh di » hanh vi, hanh de, hang di
cua tuc » cua duc, cua thuoc, luat tuc
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
tuc va » truc va, tuc xa, duc va
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 ky nang xa hoi. hieu dac luat ((tuc va) OR (thuc va)) hanh di ((cua tu) or (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu dac luat ((tuc va) OR (thuc va)) hanh di ((cua tu) OR (cua tuc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu dac luat ((tuc va) OR (thuc va)) hanh di ((cua tu) or (cua tuc))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu dac luat ((tuc va) OR (thuc va)) hanh di ((cua tu) or (cua tuc))*.