Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
sach vu » sach va, sach tu, sach uu
xuc van » duc van, luc van, vuc van
cao xuc » cam xuc, cao duc, cao suc
hieu va » lieu va, hieu qua
su tien » su kien, su hien, tu tieng
nang ma » tang ma, sang ma, nang cao
nang xa » lang xa, mang xa, ang xa
va cao » va cac, va co, va dao
vi su » va su, ve su, ki su

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