Perhaps you should try some spelling variations:
trong van » trong cac
hieu van » hieu va, thien van, lieu va
lang van » dang van, tang van, hoang van
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
van cam » van nam, van lam, van cau
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
cuu tre » cau tren, cau treo
xuc va » duc va, tuc va, luc va

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 ty ((lang van) or (trong van)) hoi. hieu van cam xuc va hanh vi ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty ((lang van) OR (trong van)) hoi. hieu van cam xuc va hanh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty ((lang van) or (trong van)) hoi. hieu van cam xuc va hanh vi ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: vu sach ty ((lang van) or (trong van)) hoi. hieu van cam xuc va hanh vi ((cua tre) OR (cuu tre))*.