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