Perhaps you should try some spelling variations:
su sach » so sach
va hanh » van hanh, va thanh, va danh
cao suc » cao su, cao duc
hieu va » lieu va, hieu qua
vu sach » vu bach, vu khach
suc va » duc va, tuc va, luc va
vi cuu » vinh cuu
vi luu » vi lua
va cao » va cac, va co, va dao
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu sach)) ky nang x hoi. hieu va cao suc va hanh ((vi cuu) or (vi luu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang x hoi. hieu va cao suc va hanh ((vi cuu) OR (vi luu)) tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky nang x hoi. hieu va cao suc va hanh ((vi cuu) or (vi luu)) tre*.