Perhaps you should try some spelling variations:
vuc nang » cuc nang, chuc nang, van nang
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
vu nang » va nang, vu dang, v nang
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
su hien » su kien, su tien, thu hien
ve su » va 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 ((vu nang) OR (vuc nang)) xa hoi. hieu va cac xuc ((van ban) or (ban hanh)) ve su hien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((vu nang) OR (vuc nang)) xa hoi. hieu va cac xuc ((van ban) OR (ban hanh)) ve su hien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((vu nang) OR (vuc nang)) xa hoi. hieu va cac xuc ((van ban) or (ban hanh)) ve su hien".
• Adding a wildcard symbol may retrieve word variants: tu sach ((vu nang) OR (vuc nang)) xa hoi. hieu va cac xuc ((van ban) or (ban hanh)) ve su hien*.