Perhaps you should try some spelling variations:
vanh dai » van dai, vanh tai, lanh dao
hanh dai » hanh tai, hanh dao, thanh dat
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
luc va » duc va, tuc va, loc va
xuc va » duc va, tuc va, xac va
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang x hoi. hieu va cac ((xuc va) OR (luc va)) ((hanh dai) or (vanh dai)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang x hoi. hieu va cac ((xuc va) OR (luc va)) ((hanh dai) OR (vanh dai)) cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang x hoi. hieu va cac ((xuc va) OR (luc va)) ((hanh dai) or (vanh dai)) cuu tre*".