Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
te sach » toc sach
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
tuc van » thuc van, truc van, tuc va
van anh » van thanh, tuan anh, van minh
cua tre » cua te, cuu tre, dua tren
y lang » o lang, tay lang, yen lang
_ lang » o lang, _ land
va cam » va cham, va cac, va cao
anh vi » hanh vi, anh va, anh ve

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