Perhaps you should try some spelling variations:
doanh than » doanh thanh, doanh nhan, doanh phan
gia doanh » gia thanh, gia dinh, giai doan
cua viet » hoa viet, cua vat, cua dieu
hieu van » hieu va, thien van, lieu va
tu cach » tu cac
cau duc » cao duc, cau luc, chu duc
duc gia » quoc gia
van cau » van dau, van hau, van chat
lang xa » lang ha, dang xay, lang van
ly lang » ly hang, ly vang, le lang
su sach » so sach, vu sach
ca viet » va viet, co viet, hoa viet

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (su sach)) ly lang xa hoi. hieu van cau duc gia doanh than ((cua viet) OR (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (su sach)) ly lang xa hoi. hieu van cau duc gia doanh than ((cua viet) OR (ca viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (su sach)) ly lang xa hoi. hieu van cau duc gia doanh than ((cua viet) OR (ca viet))".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (su sach)) ly lang xa hoi. hieu van cau duc gia doanh than ((cua viet) OR (ca viet))*.