Perhaps you should try some spelling variations:
thuat thuc » thuat thuy, thuyet thuc, thuc thuc
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
chat huu » pham huu
hanh dai » hanh tai, hanh dao, vanh dai
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
nang xa » nang x, lang xa, nang ma
cuu tre » cau tren, cau treo
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 ((chat huu) or (thuat thuc)) va hanh dai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang xa hoi. hieu van ((chat huu) OR (thuat thuc)) va hanh dai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang xa hoi. hieu van ((chat huu) or (thuat thuc)) va hanh dai ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang xa hoi. hieu van ((chat huu) or (thuat thuc)) va hanh dai ((cua tre) OR (cuu tre))*.