Perhaps you should try some spelling variations:
dinh viet » ninh viet, danh viet, trinh viet
minh viet » ninh viet, kinh viet, tinh viet
luc van » luoc van, luu van, duc van
cao luc » bao luc, cao duc, cao suc
hieu va » lieu va, hieu qua
sach vu » sach va, sach tu, sach uu
nang xa » nang x, lang xa, nang ma
cach tu » cach thuc
su tien » su kien, su hien, tu tieng
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: tu ((sach vu) or (cach tu)) nang xa hoi. hieu va cao luc van ((minh viet) OR (dinh viet)) su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach vu) OR (cach tu)) nang xa hoi. hieu va cao luc van ((minh viet) OR (dinh viet)) su tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach vu) or (cach tu)) nang xa hoi. hieu va cao luc van ((minh viet) OR (dinh viet)) su tien".
• Adding a wildcard symbol may retrieve word variants: tu ((sach vu) or (cach tu)) nang xa hoi. hieu va cao luc van ((minh viet) OR (dinh viet)) su tien*.