Perhaps you should try some spelling variations:
thien san » thien van, trien san, thien ban
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
hanh vai » hanh vi, hanh va, hanh tai
nang xa » nang x, lang xa, nang ma
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, dua tren
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
pham » phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky nang xa hoi. thien san pham duc van hanh vai ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang xa hoi. thien san pham duc van hanh vai ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: tu san ky nang xa hoi. thien san pham duc van hanh vai ((cua tre) or (cua triet))*.