Perhaps you should try some spelling variations:
tu tuong » tu dong
tu tieng » luc tieng, tu trong
van hanh » van thanh, ban hanh, van anh
sach vu » sach va, sach tu, sach uu
su hien » su kien, su tien, thu hien
hanh ve » hanh vi, hanh va, hanh kem
te sach » toc sach
cao luc » bao luc, cao duc, cao suc
hieu va » lieu va, hieu qua
vu nang » vuc nang, va nang, vu dang
luc van » luoc van, luu van, duc van
va cao » va cac, va co, va dao
x hoi » xa hoi, o hoi, x ho

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