Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, lieu va, hieu ve
nang xa » nang x, lang xa, nang ma
lam duc » lam duoc, pham duc, nam duoc
duc ban » duc tan, duc van, dua ban
tai cua » thai cua, tai cuc, dai cua
y nang » ky nang, ly nang, v nang

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) or (thien van)) lam duc ban thanh ((tai cua) OR (tri cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang xa hoi. ((hieu van) OR (thien van)) lam duc ban thanh ((tai cua) OR (tri cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang xa hoi. ((hieu van) or (thien van)) lam duc ban thanh ((tai cua) OR (tri cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang xa hoi. ((hieu van) or (thien van)) lam duc ban thanh ((tai cua) OR (tri cua)) tre*.