Perhaps you should try some spelling variations:
sang mai » sang ma, sang tai, lang mai
hieu van » hieu va, thien van, lieu va
danh sai » dung sai, danh bat, danh dau
danh lai » gianh lai, dinh lam, hanh lam
cua tre » cua te, cuu tre, cua triet
mai hoi » mai khoi, dai hoi, lai hoi
cam duc » cao duc, pham duc, nam duoc
ky sang » ky nang, ky dang, ky tang
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. hieu van ((cam duc) or (cam xuc)) va ((danh lai) OR (danh sai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ky sang mai hoi. hieu van ((cam duc) OR (cam xuc)) va ((danh lai) OR (danh sai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cac ky sang mai hoi. hieu van ((cam duc) or (cam xuc)) va ((danh lai) OR (danh sai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te cac ky sang mai hoi. hieu van ((cam duc) or (cam xuc)) va ((danh lai) OR (danh sai)) cua tre*.