Perhaps you should try some spelling variations:
ve triet » va trien, su triet
van hanh » van thanh, ban hanh, van anh
dang xay » dang van, van xay
va hanh » va thanh, va danh, ban hanh
cam tuc » cam xuc, cam tu, nam thuc
te sach » toc sach
hieu ve » hieu va, hieu van
lang xa » lang ha, lang van
ve cam » ve cham, ve cac, va cam
ve ve » de ve, va ve, ke ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y ((lang xa) or (dang xay)) hoi. hieu ve cam tuc ((va hanh) OR (van hanh)) ve ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((lang xa) OR (dang xay)) hoi. hieu ve cam tuc ((va hanh) OR (van hanh)) ve ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((lang xa) or (dang xay)) hoi. hieu ve cam tuc ((va hanh) OR (van hanh)) ve ve triet".
• Adding a wildcard symbol may retrieve word variants: te sach y ((lang xa) or (dang xay)) hoi. hieu ve cam tuc ((va hanh) OR (van hanh)) ve ve triet*.