Perhaps you should try some spelling variations:
danh nhan » doanh nhan, thanh nhan, benh nhan
van nhan » van phan, van thanh, van khanh
nang mai » nang ma, nang tai, lang mai
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
mai hoi » mai khoi, dai hoi, lai hoi
cai ky » cac ky, cam ky, sai ky
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua

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) or (cao ky)) nang mai hoi. hieu ((van nhan) OR (danh nhan)) luc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((cai ky) OR (cao ky)) nang mai hoi. hieu ((van nhan) OR (danh nhan)) luc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((cai ky) or (cao ky)) nang mai hoi. hieu ((van nhan) OR (danh nhan)) luc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((cai ky) or (cao ky)) nang mai hoi. hieu ((van nhan) OR (danh nhan)) luc va hanh vi cua tre*.