Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
doanh va » doan va, doanh tai, doanh cua
su triet » su viet, su tien, ve triet
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ve chai » ve cai, ve chat, va chai
chai tu » cai tu, choi tu, chay tu
y lang » o lang, _ lang, tay lang
tu van » tu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) y lang xa hoi. hieu ve chai tu van doanh va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) y lang xa hoi. hieu ve chai tu van doanh va su triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) y lang xa hoi. hieu ve chai tu van doanh va su triet*.