Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
doanh van » doan van, doanh va, doanh ban
van doanh » toan doanh, van dong, van thanh
dau treo » dau tren, cau treo, dau theo
thu nang » thi nang, thu hang, thu bang
van dau » van dao, phan dau
duy van » duy vat, dung van
su sach » so sach, vu sach
ve pham » vi pham, ve phan, ve phat
v pham » vi pham, d pham
x hoi » xa hoi, o hoi, x ho

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) or (thuoc sach)) thu nang x hoi. hieu ((ve pham) OR (v pham)) duy van doanh van dau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thuoc sach)) thu nang x hoi. hieu ((ve pham) OR (v pham)) duy van doanh van dau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (thuoc sach)) thu nang x hoi. hieu ((ve pham) OR (v pham)) duy van doanh van dau treo".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thuoc sach)) thu nang x hoi. hieu ((ve pham) OR (v pham)) duy van doanh van dau treo*.