Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
lang xa » lang ha, dang xay, lang van
van cac » van hac, van cau, van bac
cac loc » cac lop, cac toc, cac hoc
va hanh » van hanh, va thanh, va danh
cua tre » cuu tre, cua triet, dua tren
te cac » tu cac, ve cac, te cao
loc va » hoc va, luc va
cua te » cua tu

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

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