Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
ky sang » ky dang, ky tang, duy sang
mai hoi » mai khoi, dai hoi, lai hoi
cam duc » cam xuc, cao duc, nam duoc
va hanh » van hanh, va thanh, va danh
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo

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

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