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