Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tu tieng » luc tieng, tu tuong, tu trong
tu sach » thu sach, su sach, tu cach
te sach » toc sach
vu nang » vuc nang, va nang, vu dang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
vuc van » duc van, luc van, thuc van
hanh ve » hanh vi, hanh va, hanh kem
co vuc » co vu
va co » vo co
ve tu » ve thu, va tu, ve su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (te sach)) vu nang xa hoi. hieu va co vuc van hanh ve tu tieng~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) vu nang xa hoi. hieu va co vuc van hanh ve tu tieng.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) vu nang xa hoi. hieu va co vuc van hanh ve tu tieng*.