Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
tinh bai » tinh bac, tinh hai, hinh bai
va triet » va thiet, va trien, ve triet
hieu ve » hieu va
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
luc va » duc va, tuc va
loc va » hoc va
bai va » mai va, ban va, dai va

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

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