Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
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 » va thanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet
te cac » tu cac, ve cac, te cao
vi cua » vai cua, di cua

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) OR (van hanh)) vi cua tre~.
• 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) OR (van hanh)) vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: te cac ky ((nang x) or (lang xa)) hoi. hieu van cac loc ((va hanh) OR (van hanh)) vi cua tre*.