Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tuan hoc » toan hoc, luan hoc, than hoc
van tuan » van quan, van ban, anh tuan
cuu tre » cau tren, cau treo
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cua triet, dua tren
lang ha » long ha
lang xa » dang xay, lang van
ban ky » van ky, dan ky
te ban » te bao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ban ky ((lang xa) or (lang ha)) hoi. hieu van tuan hoc va hanh vi ((cuu tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ban ky ((lang xa) OR (lang ha)) hoi. hieu van tuan hoc va hanh vi ((cuu tre) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: te ban ky ((lang xa) or (lang ha)) hoi. hieu van tuan hoc va hanh vi ((cuu tre) or (cua tre))*.