Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
van hanh » van thanh, ban hanh, van anh
nang mai » nang ma, nang tai, lang mai
hanh va » hang va, hanh vi
cac xuc » cac nuoc, chat xuc, cac cuoc
sach ty » sach tu, sach thu, xach tay
mai hoi » mai khoi, dai hoi, lai hoi
va hoa » van hoa, va hoc, ma hoa

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