Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
nang lai » nang tai, mang lai, nang cai
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua dieu
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
lai hoi » dai hoi, lai hoa, lai roi
cac xuc » cac nuoc, chat xuc, cac cuoc

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 lai hoi. hieu hien ((cac xuc) or (cam xuc)) van hanh vi ((cua viet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang lai hoi. hieu hien ((cac xuc) OR (cam xuc)) van hanh vi ((cua viet) OR (cua vat)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang lai hoi. hieu hien ((cac xuc) or (cam xuc)) van hanh vi ((cua viet) or (cua vat))*.