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
nang mai » nang tai, lang mai, nang cai
nang ma » tang ma, sang ma, nang cao
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 ((nang mai) OR (nang 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 ((nang mai) OR (nang ma)) hoi. bieu hien ((cac xuc) OR (cam xuc)) van hanh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu ((nang mai) OR (nang 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 ((nang mai) OR (nang ma)) hoi. bieu hien ((cac xuc) or (cam xuc)) van hanh vi cua viet*.