Perhaps you should try some spelling variations:
bieu hien » dieu hien, dieu khien, bien phien
van hanh » van thanh, ban hanh, van anh
sach thu » sach thue, sach thieu, sach tham
cua viet » ca viet, hoa viet, cua vat
tang mai » tang tai, lang mai, sang mai
tang ma » mang may, tang van
cac xuc » cac nuoc, chat xuc, cac cuoc
tu sach » thu sach, su sach, te sach
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 sach thu ((tang mai) or (tang ma)) hoi. bieu hien ((cac xuc) or (cam xuc)) van hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu ((tang mai) OR (tang ma)) hoi. bieu hien ((cac xuc) OR (cam xuc)) van hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach thu ((tang mai) or (tang ma)) hoi. bieu hien ((cac xuc) or (cam xuc)) van hanh vi cua viet*.