Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
lang van » dang van, tang van, hoang van
van thai » van thoai, van tai, van hai
cuu tre » cau tren, cau treo
va hanh » van hanh, va thanh, va danh
thai do » thay doi, thai den
cua tre » cua te, cua triet, dua tren
van hoi » van hoa, van hoc, van hoe
ky lang » ky nang, ky dang, ky tang
te cac » tu cac, ve cac, te cao
te sac » te sach, te san
do va » do van, so va

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

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