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
tuc van » thuc van, truc van, tuc va
cao tuc » dao tuc, cao duc, cao suc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano
va cao » va cac, va co, va dao
vi cua » vai cua
di cua » dai cua, doi cua, de 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 van hanh ((vi cua) OR (di 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 van hanh ((vi cua) OR (di 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 van hanh ((vi cua) OR (di cua)) tre*".