Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
hieu van » hieu va, thien van, lieu va
hoc tuc » hoc thuc, hoc truc, hoc tu
vu sach » vu bach, su sach
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
van hoc » van hoa
xa dan » ca dan, xa dai, va dan
hai ve » hoai ve, hai va, hoi ve
hai vu » hai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) OR (vu khach)) ty nang xa hoi. hieu van hoc tuc xa dan ((hai ve) or (hai vu)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) ty nang xa hoi. hieu van hoc tuc xa dan ((hai ve) OR (hai vu)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (vu khach)) ty nang xa hoi. hieu van hoc tuc xa dan ((hai ve) or (hai vu)) triet".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (vu khach)) ty nang xa hoi. hieu van hoc tuc xa dan ((hai ve) or (hai vu)) triet*.