Perhaps you should try some spelling variations:
thuc thuc » hoc thuc
thu sach » tu sach, thuat sach, thuoc sach
vanh dai » van dai, vanh tai, lanh dao
hieu van » hieu va, thien van, lieu va
chat huu » pham huu
hanh dai » hanh tai, hanh dao, thanh dat
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
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 (thuc thuc)) va ((hanh dai) OR (vanh dai)) cua 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 (thuc thuc)) va ((hanh dai) OR (vanh dai)) cua 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 (thuc thuc)) va ((hanh dai) OR (vanh dai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang xa hoi. hieu van ((chat huu) or (thuc thuc)) va ((hanh dai) OR (vanh dai)) cua tre*.