Perhaps you should try some spelling variations:
tu tieng » luc tieng, tu tuong, tu trong
thanh va » thanh van, hanh va, thanh ha
thanh ve » hanh ve, thanh vien, thanh van
sach vu » sach va, sach tu, sach uu
vuc ban » vu ban, duc ban, cuc ban
su sach » so sach, vu sach
vu nang » vuc nang, va nang, vu dang
hieu va » lieu va, hieu qua
cao vuc » cao duc, cao suc, cao vu
va cao » va cac, va co, va dao
x hoi » o hoi, x ho, 5 hoi

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 vu nang ((x hoi) or (xa hoi)). hieu va cao vuc ban ((thanh ve) or (thanh va)) tu tieng~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach vu nang ((x hoi) OR (xa hoi)). hieu va cao vuc ban ((thanh ve) OR (thanh va)) tu tieng.
• Adding a wildcard symbol may retrieve word variants: su sach vu nang ((x hoi) or (xa hoi)). hieu va cao vuc ban ((thanh ve) or (thanh va)) tu tieng*.