Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
nang mai » nang tai, lang mai, nang cai
van hanh » van thanh, ban hanh, van anh
hanh va » hang va, hanh vi
cac xuc » cac nuoc, chat xuc, cac cuoc
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
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 ((nang mai) OR (nang ma)) 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 ((nang mai) OR (nang ma)) 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 ((nang mai) OR (nang ma)) hoi. hieu hien ((cac xuc) or (cam xuc)) van hanh va hoa viet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang mai) OR (nang ma)) hoi. hieu hien ((cac xuc) or (cam xuc)) van hanh va hoa viet*.