Perhaps you should try some spelling variations:
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham cuu » cap cuu, chat cua
va danh » va dinh, va dan, va hanh
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
cua tre » cuu tre, cua triet, dua tren
tu cai » tu cac, tu can, tu bai
cai ky » cao ky, cac ky, cam ky
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cai ky dang xa hoi. hieu van cham cuu ((ban hanh) or (va danh)) di ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cai ky dang xa hoi. hieu van cham cuu ((ban hanh) OR (va danh)) di ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu cai ky dang xa hoi. hieu van cham cuu ((ban hanh) or (va danh)) di ((cua tre) or (cua te))*.