Perhaps you should try some spelling variations:
hoc thuc » hoc huu
hieu van » hieu va, thien van, lieu va
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
van hoc » van hoa
nang xa » nang x, lang xa, nang ma
va danh » va dinh, va dan, va hanh
y nang » ky nang, ly nang, v nang
hai ve » hoai ve, hoi ve, dai ve
hai va » hai van, thai va, hoi va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang xa hoi. hieu van hoc thuc va danh ((((hai ve) or (hai va))) or (hai vu)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. hieu van hoc thuc va danh ((((hai ve) OR (hai va))) OR (hai vu)) triet.
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu van hoc thuc va danh ((((hai ve) or (hai va))) or (hai vu)) triet*.