Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
van hanh » van thanh, ban hanh, van anh
hanh va » hang va, hanh vi
cac xuc » cac nuoc, chat xuc, cac cuoc
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
dai hoi » dai hoc, dai hai, dai moi
mai hoi » mai khoi, lai hoi, mai doi
va cua » va chua, via cua, ca 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 sach ty xang ((mai hoi) or (dai hoi)). hieu hien ((cac xuc) or (cam xuc)) van hanh va cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty xang ((mai hoi) OR (dai hoi)). hieu hien ((cac xuc) OR (cam xuc)) van hanh va cua vat.
• Adding a wildcard symbol may retrieve word variants: su sach ty xang ((mai hoi) or (dai hoi)). hieu hien ((cac xuc) or (cam xuc)) van hanh va cua vat*.