Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
ban hanh » ban hang
vu lang » vu dang, cu lang, tu lang
va lang » va nang, hoa lang
hieu va » lieu va, hieu qua
cao suc » cao su, cao duc
suc ban » suc ben, duc ban, cuc ban
hanh va » hang va, hanh vi
su hien » su kien, su tien, thu hien
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: thuat sach ((vu lang) or (va lang)) xa hoi. hieu va cao suc ban hanh va su hien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((vu lang) OR (va lang)) xa hoi. hieu va cao suc ban hanh va su hien.
• Adding a wildcard symbol may retrieve word variants: thuat sach ((vu lang) or (va lang)) xa hoi. hieu va cao suc ban hanh va su hien*.