Perhaps you should try some spelling variations:
van trieu » tan trieu, van tieu, van hieu
tang hanh » tang thanh, dang hanh, nang hanh
tan hanh » tan thanh, toan hanh, tran hanh
te sach » toc sach
nang xa » lang xa, nang ma, mang xa
hieu va » lieu va, hieu qua
cao duc » dao duc, cao suc, giao duc
va cao » va cac, va co, va dao

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 ((nang xa) or (nang x)) hoi. hieu va cao duc ((tan hanh) OR (tang hanh)) vi van trieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang xa) OR (nang x)) hoi. hieu va cao duc ((tan hanh) OR (tang hanh)) vi van trieu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((nang xa) or (nang x)) hoi. hieu va cao duc ((tan hanh) OR (tang hanh)) vi van trieu".
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang xa) or (nang x)) hoi. hieu va cao duc ((tan hanh) OR (tang hanh)) vi van trieu*.