Perhaps you should try some spelling variations:
va hanh » van hanh, va thanh, va danh
nam xuc » cam xuc, nam xua, nam thuc
sach ky » sac ky, sach y, sach kem
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
ca viet » va viet, co viet, hoa viet
va nam » van nam, ha nam, va nay
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: su ((sach ky) or (sach ty)) nang xa hoi. hieu va nam xuc va hanh vi ((cua vat) or (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach ty)) nang xa hoi. hieu va nam xuc va hanh vi ((cua vat) OR (ca viet)).
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach ty)) nang xa hoi. hieu va nam xuc va hanh vi ((cua vat) or (ca viet))*.