Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
van hanh » van thanh, ban hanh, van anh
tu sach » su sach, te sach, tu cach
vu nang » vuc nang, va nang, vu dang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cao xuc » cam xuc, cao duc, cao suc
xuc van » duc van, luc van, vuc van
hanh ve » hanh vi, hanh va, hanh kem
va cao » va cac, va co, va dao
ve su » va su
kien » bien, vien, tien

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 ve su kien~.
• 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 ve su kien".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) vu nang xa hoi. hieu va cao xuc van hanh ve su kien*.