Perhaps you should try some spelling variations:
chiet tach » chieu sach
doi chiet » doi chieu, doi chi, doi viet
nang cong » nang song, dang cong, bang cong
cong manh » cong danh, duong manh, cong thanh
tang cua » mang cua, tang luan, thong cua
hang cua » mang cua, hang ca, huong cua
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chiet tach - hanh ((tang cua) or (hang cua)) nang cong manh ((toan tap) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chiet tach - hanh ((tang cua) OR (hang cua)) nang cong manh ((toan tap) OR (toan ban))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chiet tach - hanh ((tang cua) or (hang cua)) nang cong manh ((toan tap) OR (toan ban))*".