Perhaps you should try some spelling variations:
danh vai » danh sai, danh va, doanh van
sach thu » sach thue, sach thieu, sach tham
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
ve pham » vi pham, v pham, ve phan
sach ty » sach y, sach tu, xach tay
hieu ve » hieu va, hieu van
cua te » cua tu
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: co ((sach ty) OR (sach thu)) nang ((x hoi) or (o hoi)). hieu ve pham duc va danh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co ((sach ty) OR (sach thu)) nang ((x hoi) OR (o hoi)). hieu ve pham duc va danh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co ((sach ty) OR (sach thu)) nang ((x hoi) or (o hoi)). hieu ve pham duc va danh vai cua te".
• Adding a wildcard symbol may retrieve word variants: co ((sach ty) OR (sach thu)) nang ((x hoi) or (o hoi)). hieu ve pham duc va danh vai cua te*.