Perhaps you should try some spelling variations:
van thang » van thanh, van khang, van hang
hieu quan » lieu quan, thien quan, lien quan
thang ma » thang mua, tang ma, thang va
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
luc van » luoc van, luu van, duc van
su hien » su kien, su tien, thu hien
cam luc » cam xuc, cau luc
bac van » bach van, cac van, ban van
tu bac » tu ban, tu cac, tu bat

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu bac van thang ma hoa. ((hieu qua) or (hieu quan)) cam luc van hanh vi ((su triet) or (su hien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bac van thang ma hoa. ((hieu qua) OR (hieu quan)) cam luc van hanh vi ((su triet) OR (su hien)).
• Adding a wildcard symbol may retrieve word variants: tu bac van thang ma hoa. ((hieu qua) or (hieu quan)) cam luc van hanh vi ((su triet) or (su hien))*.