Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
van thanh » ban thanh, van tuan
thanh vi » hanh vi, thanh va, thanh ve
cua viet » ca viet, hoa viet, cua vat
nang tai » hang tai, tang tai, sang tai
nang mai » nang ma, lang mai, nang cai
sach ty » sach y, sach tu, sach thu
cac xuc » cac nuoc, chat xuc, cac cuoc
su sach » so sach, vu 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: su sach ty ((nang mai) OR (nang tai)) hoi. hieu hien ((cac xuc) or (cam xuc)) van thanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang mai) OR (nang tai)) hoi. hieu hien ((cac xuc) OR (cam xuc)) van thanh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang mai) OR (nang tai)) hoi. hieu hien ((cac xuc) or (cam xuc)) van thanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang mai) OR (nang tai)) hoi. hieu hien ((cac xuc) or (cam xuc)) van thanh vi cua viet*.