Perhaps you should try some spelling variations:
thanh lai » thanh hai, thanh lap, thanh loi
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
sang mai » sang ma, sang tai, lang mai
cua tre » cua te, cuu tre, cua triet
lai cua » dai cua, hai cua, lai chau
cam duc » cao duc, pham duc, nam duoc
mai hoi » mai khoi, dai hoi, lai hoi
ky sang » ky nang, ky dang, ky tang
te cao » te bao
te cac » tu cac, ve cac, de cac

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