Perhaps you should try some spelling variations:
nhanh mang » hanh mang, nhanh quang, nhanh thang
nhanh lang » nhanh quang, nhanh thang, nhan dang
hieu sach » chieu sach, hieu cach, dien sach
luan hanh » luan thanh, luan han, luan danh
nhung tap » nhung bai, nhung cau, nhung van
doc hieu » toc thieu, hoc thieu, hoc hien
chung ta » chung tu, chung cu, chung vi
doan dau » doan dieu, phan dau, doan va

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu sach - ((nhanh mang) or (nhanh lang)) luan hanh ((nhung tap) OR (chung ta)) doan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - ((nhanh mang) OR (nhanh lang)) luan hanh ((nhung tap) OR (chung ta)) doan dau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu sach - ((nhanh mang) or (nhanh lang)) luan hanh ((nhung tap) OR (chung ta)) doan dau*".