Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cau treo » cau theo, cau tren, cau triet
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
cac tuc » cac toc, cac tu, cac tac
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren
y nang » ky nang, ly nang, v nang
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach y nang xa hoi. hieu van cac tuc va hanh vi ((cua tre) or (((cuu tre) OR (cau treo))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang xa hoi. hieu van cac tuc va hanh vi ((cua tre) OR (((cuu tre) OR (cau treo)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y nang xa hoi. hieu van cac tuc va hanh vi ((cua tre) or (((cuu tre) OR (cau treo))))".
• Adding a wildcard symbol may retrieve word variants: vu sach y nang xa hoi. hieu van cac tuc va hanh vi ((cua tre) or (((cuu tre) OR (cau treo))))*.