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 lop » cac hop, cac loai
va hanh » van hanh, va thanh, va danh
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
lop va » lap va, hop va, nop va
vi cua » vai cua, di cua
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 sac ky ((nang x) OR (lang xa)) hoi. hieu van cac lop va hanh vi cua te~.
• Adding a wildcard symbol may retrieve word variants: te sac ky ((nang x) or (lang xa)) hoi. hieu van cac lop va hanh vi cua te*.