Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
hanh va » hang va, hanh vi
luc van » luoc van, luu van, duc van
cam luc » cam xuc, cau luc
hieu va » lieu va, hieu qua
su hien » su kien, su tien, thu hien
nang xa » lang xa, nang ma, mang xa
su sach » so sach, vu sach
va cam » va cham, va cac, va cao

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) or (su sach)) ty ((nang xa) or (nang x)) hoi. hieu va cam luc van hanh va su hien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (su sach)) ty ((nang xa) OR (nang x)) hoi. hieu va cam luc van hanh va su hien.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (su sach)) ty ((nang xa) or (nang x)) hoi. hieu va cam luc van hanh va su hien*.