Perhaps you should try some spelling variations:
dieu hien » dieu khien, dieu kien, bieu hien
van hanh » van thanh, ban hanh, van anh
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
xach tay » canh tay
cua viet » ca viet, hoa viet, cua vat
nang mai » nang ma, nang tai, lang mai
mai hoi » mai khoi, dai hoi, lai hoi
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: su ((xach tay) or (sach y)) nang mai hoi. dieu hien ((cac nuoc) or (cam xuc)) van hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((xach tay) OR (sach y)) nang mai hoi. dieu hien ((cac nuoc) OR (cam xuc)) van hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: su ((xach tay) or (sach y)) nang mai hoi. dieu hien ((cac nuoc) or (cam xuc)) van hanh vi cua viet*.