Perhaps you should try some spelling variations:
tieu sach » chieu sach, dien sach, te sach
tang luan » dung luan
phan cong » thanh cong
anh tang » anh bang, anh dang, anh nang
han cong » hang cong, hanh cong, han tong
san toan » van toan, dan toan, manh toan
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: theo tieu sach - anh tang luan ((han cong) OR (phan cong)) san toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu sach - anh tang luan ((han cong) OR (phan cong)) san toan ban".
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - anh tang luan ((han cong) OR (phan cong)) san toan ban*.