Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
vu lang » va lang, vu dang, tu lang
cu lang » cua lang, tu lang, xu lang
hieu va » lieu va, hieu qua
cao suc » cao su, cao duc
suc van » su van, duc van, luc van
hanh va » hang va, hanh vi
su tien » su kien, su hien, tu tieng
va cao » va cac, va co, va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((vu lang) or (cu lang)) xa hoi. hieu va cao suc van hanh va su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((vu lang) OR (cu lang)) xa hoi. hieu va cao suc van hanh va su tien.
• Adding a wildcard symbol may retrieve word variants: thu sach ((vu lang) or (cu lang)) xa hoi. hieu va cao suc van hanh va su tien*.