Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » thien van, lieu va, hieu ve
chat xuc » chat huu, cam xuc, chat cua
danh dau » lanh dao, hang dau, danh tu
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
dau cua » dai cua, day cua, cau cua
cua tre » cua te, cuu tre, cua triet
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 (hieu va)) ((chat xuc) or (chao xu)) va danh dau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang xa hoi. ((hieu van) OR (hieu va)) ((chat xuc) OR (chao xu)) va danh dau cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang xa hoi. ((hieu van) OR (hieu va)) ((chat xuc) or (chao xu)) va danh dau cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang xa hoi. ((hieu van) OR (hieu va)) ((chat xuc) or (chao xu)) va danh dau cua tre*.