Perhaps you should try some spelling variations:
su triet » su viet, su tien
ve triet » va trien
van hanh » van thanh, ban hanh, van anh
cam luc » cam xuc, cau luc
luc van » luoc van, luu van, duc van
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
hang xa » hoang xa, hang va, hang ca
ty hang » ly hang, ty xang, thi hang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty hang xa hoi. ((hieu ve) or (hieu qua)) cam luc van hanh vi ((ve triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty hang xa hoi. ((hieu ve) OR (hieu qua)) cam luc van hanh vi ((ve triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: so sach ty hang xa hoi. ((hieu ve) or (hieu qua)) cam luc van hanh vi ((ve triet) or (su triet))*.