Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
nang xa » lang xa, nang ma, mang xa
van cam » van lam, van cau, van dam
xuc van » duc van, luc van, xuc ban
su tien » su kien, su hien, tu tieng
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: su sach ty ((nang xa) or (nang x)) hoi. hieu ((van cam) OR (van nam)) xuc van hanh vi su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (nang x)) hoi. hieu ((van cam) OR (van nam)) xuc van hanh vi su tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang xa) or (nang x)) hoi. hieu ((van cam) OR (van nam)) xuc van hanh vi su tien".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) or (nang x)) hoi. hieu ((van cam) OR (van nam)) xuc van hanh vi su tien*.