Perhaps you should try some spelling variations:
thanh dung » thanh duong, thanh tung, thanh hung
nong cong » cong cong, nang cong, dong cong
tong cong » trong cong, cong cong, dung cong
manh toan » thanh toan, anh tuan, tinh toan
doc dien » duoc dien, doi dien, don dien
dung cua » dung luan, dung cho
toan cao » toan ban, toan tap
do dien » doi dien, co dien, o dien

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc dien) or (do dien)) sach - thanh dung cua ((nong cong) OR (tong cong)) manh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc dien) OR (do dien)) sach - thanh dung cua ((nong cong) OR (tong cong)) manh toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc dien) or (do dien)) sach - thanh dung cua ((nong cong) OR (tong cong)) manh toan cao".
• Adding a wildcard symbol may retrieve word variants: ((doc dien) or (do dien)) sach - thanh dung cua ((nong cong) OR (tong cong)) manh toan cao*.