Perhaps you should try some spelling variations:
va hanh » van hanh, va thanh, ban hanh
mang xa » mang may, dang xay, mang cua
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, dia danh
cac loc » cac lop, cac toc, cac hoc
te san » te ban, ke san, tu san
di cua » dai cua, doi cua, de cua
ve cac » va cac, vien cac
san ky » sang ky, van ky, dan ky
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te san ky ((mang xa) or (lang xa)) hoi. hieu ve cac loc ((va hanh) OR (va danh)) di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te san ky ((mang xa) OR (lang xa)) hoi. hieu ve cac loc ((va hanh) OR (va danh)) di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te san ky ((mang xa) or (lang xa)) hoi. hieu ve cac loc ((va hanh) OR (va danh)) di cua te".
• Adding a wildcard symbol may retrieve word variants: te san ky ((mang xa) or (lang xa)) hoi. hieu ve cac loc ((va hanh) OR (va danh)) di cua te*.