Perhaps you should try some spelling variations:
vu khanh » vu thanh, van khanh, duy khanh
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
cao suc » cao su, cao duc
va hanh » van hanh, va thanh, va danh
luu tre » cuu tre, luy tre
ve cao » va cao, ve bao, ve cac
suc va » duc va, tuc va, luc va
x hoi » xa hoi, o hoi, x ho
tru » truc

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (vu khanh)) ky nang x hoi. hieu ve cao suc va hanh vi ((luu tre) OR (luu tru))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (vu khanh)) ky nang x hoi. hieu ve cao suc va hanh vi ((luu tre) OR (luu tru)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (vu khanh)) ky nang x hoi. hieu ve cao suc va hanh vi ((luu tre) OR (luu tru))".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (vu khanh)) ky nang x hoi. hieu ve cao suc va hanh vi ((luu tre) OR (luu tru))*.