Perhaps you should try some spelling variations:
danh lai » danh sai, gianh lai, dinh lam
cua tre » cua te, cuu tre, cua triet
mai hoi » mai khoi, lai hoi, mai doi
lai cua » dai cua, hai cua, lai chau
dai hoi » dai hoc, dai hai, dai moi
hieu ve » hieu va, hieu van
ky sang » ky nang, ky dang, ky tang
cam duc » cao duc, pham duc, nam duoc
va danh » va dinh, va dan, va hanh
te cac » tu cac, ve cac, te cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te cac ky sang ((mai hoi) OR (dai hoi)). hieu ve ((cam duc) or (cam xuc)) va danh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ky sang ((mai hoi) OR (dai hoi)). hieu ve ((cam duc) OR (cam xuc)) va danh lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cac ky sang ((mai hoi) OR (dai hoi)). hieu ve ((cam duc) or (cam xuc)) va danh lai cua tre".
• Adding a wildcard symbol may retrieve word variants: te cac ky sang ((mai hoi) OR (dai hoi)). hieu ve ((cam duc) or (cam xuc)) va danh lai cua tre*.