Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
va hanh » va thanh, va danh, ban hanh
lang xa » lang ha, dang xay, lang van
vai cua » dai cua, hai cua, lai cua
hieu ve » hieu va, hieu van
cac loc » cac lop, cac toc, cac hoc
tu sac » tu sach, tu cac, tu san
ve cac » va cac, vien cac
sac ky » cac ky, sai 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: tu sac ky ((lang xa) or (van xay)) hoi. hieu ve cac loc ((va hanh) OR (van hanh)) vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((lang xa) OR (van xay)) hoi. hieu ve cac loc ((va hanh) OR (van hanh)) vai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((lang xa) or (van xay)) hoi. hieu ve cac loc ((va hanh) OR (van hanh)) vai cua te*".