Perhaps you should try some spelling variations:
vanh dai » van dai, vanh tai, lanh dao
hanh dao » lanh dao, thanh dat, thanh dam
nang xa » nang x, lang xa, nang ma
hieu va » lieu va
ca viet » va viet, co viet, hoa viet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
soc va » hoc va, loc va, doc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang xa hoi. ((hieu va) or (hieu qua)) cham soc va ((vanh dai) or (hanh dao)) ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang xa hoi. ((hieu va) OR (hieu qua)) cham soc va ((vanh dai) OR (hanh dao)) ca viet.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang xa hoi. ((hieu va) or (hieu qua)) cham soc va ((vanh dai) or (hanh dao)) ca viet*.