Perhaps you should try some spelling variations:
tu tieng » luc tieng, tu tuong, tu trong
doc sach » hoc sach, toc sach, nuoc sach
van hanh » van thanh, ban hanh, van anh
su hien » su kien, su tien, thu hien
hanh ve » hanh vi, hanh va, hanh kem
luu van » cuu van, luan van, luu hanh
te sach » toc sach
hieu va » lieu va, hieu qua
vu nang » vuc nang, va nang, vu dang
co luu » co lau, co luy, so luu
x hoi » xa hoi, o hoi, x ho
va co » vo co

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 (doc sach)) vu nang x hoi. hieu va co luu van hanh ve ((su hien) or (tu tieng))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (doc sach)) vu nang x hoi. hieu va co luu van hanh ve ((su hien) OR (tu tieng)).
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (doc sach)) vu nang x hoi. hieu va co luu van hanh ve ((su hien) or (tu tieng))*.