Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
van hanh » van thanh, ban hanh, van anh
van chat » cao chat
tu sach » thu sach, te sach, tu cach
luc van » luoc van, luu van, duc van
van cau » van dau, van hau, toan cau
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano
su sach » so sach, vu sach
su viet » so viet
dai su » dai sua, dai so, dan su

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) tu nang xa hoi. hieu ((van cau) OR (van chat)) luc van hanh dai su viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) tu nang xa hoi. hieu ((van cau) or (van chat)) luc van hanh dai su viet~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) tu nang xa hoi. hieu ((van cau) or (van chat)) luc van hanh dai su viet*.