Perhaps you should try some spelling variations:
hoc nhanh » hoc nganh, hoc phan
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
cao tuc » dao tuc, cao suc, cao toc
cao duc » dao duc, cao suc, giao duc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (hoc nhanh)) tu nang xa hoi. hieu va ((cao tuc) OR (cao duc)) van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc nhanh)) tu nang xa hoi. hieu va ((cao tuc) OR (cao duc)) van hanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (hoc nhanh)) tu nang xa hoi. hieu va ((cao tuc) OR (cao duc)) van hanh vi cua tre*".