Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
cua viet » hoa viet, cua vat, cua dieu
hien cam » hien cac, hien cau, hien giam
va hanh » van hanh, va thanh, va danh
sach tu » sach thu, cach tu, sach ty
tu sach » thu sach, su sach, te sach
lai hoa » dai hoa, loai hoc
lai hoi » dai hoi, lai roi, mai hoi
tu nang » tru nang, tu nong, tu nano
ca viet » va viet, co viet, hoa viet
xuc va » duc va, tuc va, luc va

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