Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
thai van » thi van, thanh van, thai vung
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
xuc va » tuc va, luc va, xac va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang xa hoi. hieu van cham ((xuc va) or (duc va)) han ((thai va) OR (thai van)) thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang xa hoi. hieu van cham ((xuc va) OR (duc va)) han ((thai va) OR (thai van)) thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang xa hoi. hieu van cham ((xuc va) or (duc va)) han ((thai va) OR (thai van)) thiet".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang xa hoi. hieu van cham ((xuc va) or (duc va)) han ((thai va) OR (thai van)) thiet*.