Perhaps you should try some spelling variations:
dieu hien » dieu khien, dieu kien, bieu hien
cua viet » ca viet, hoa viet, cua vat
mai hoi » mai khoi, lai hoi, mai doi
dai hoi » dai hoc, dai hai, dai moi
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cac xuc » cac nuoc, chat xuc, cac cuoc
van anh » van thanh, tuan anh, van minh
anh vai » anh va, anh bai, anh van
vai cua » dai cua, hai cua, lai cua
su sach » so sach, vu sach

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ((mai hoi) OR (dai hoi)). dieu hien ((cac xuc) OR (cam xuc)) van anh vai cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ((mai hoi) OR (dai hoi)). dieu hien ((cac xuc) or (cam xuc)) van anh vai cua viet~".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ((mai hoi) OR (dai hoi)). dieu hien ((cac xuc) or (cam xuc)) van anh vai cua viet*.