Perhaps you should try some spelling variations:
tan hanh » tan thanh, tang hanh, toan hanh
hanh tai » thanh tai, hang tai, han tai
hieu ve » hieu va, hieu van
cao duc » dao duc, cao suc, giao duc
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ve cao » va cao, ve bao, ve cac
cuc cu » cuc du, cu cu, cua cu
x hoi » xa hoi, o hoi, x ho
o hai » co hai, so hai, o lai

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 ((x hoi) or (o hai)). hieu ve cao duc tan hanh tai cuc cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((x hoi) OR (o hai)). hieu ve cao duc tan hanh tai cuc cu.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((x hoi) or (o hai)). hieu ve cao duc tan hanh tai cuc cu*.