Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
tu tieng » luc tieng, tu tuong, tu trong
van hanh » ban hanh, van anh, van ban
hieu va » lieu va, hieu qua
sach vu » sach va, sach tu, sach uu
vu nang » vuc nang, va nang, vu dang
su hien » su kien, su tien, thu hien
te sach » toc sach
co luc » coc luc, co luy
va co » vo co
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 co luc ((van hanh) OR (van thanh)) ve ((su hien) or (tu tieng))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach vu nang x hoi. hieu va co luc ((van hanh) OR (van thanh)) ve ((su hien) OR (tu tieng)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach vu nang x hoi. hieu va co luc ((van hanh) OR (van thanh)) ve ((su hien) or (tu tieng))".
• Adding a wildcard symbol may retrieve word variants: te sach vu nang x hoi. hieu va co luc ((van hanh) OR (van thanh)) ve ((su hien) or (tu tieng))*.