Perhaps you should try some spelling variations:
tong thanh » thong thanh, trong thanh, dong thanh
theo chu » theo chieu, cho chu, chao chu
chu sach » cau sach, thu sach, chieu sach
trang va » hang va
tran van » luan van
tra cau » tra sau, ta cau, toan cau
tra cuu » trau cua, trua cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chu sach - hanh ((trang va) or (tran van)) han tong thanh ((tra cau) OR (tra cuu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chu sach - hanh ((trang va) OR (tran van)) han tong thanh ((tra cau) OR (tra cuu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chu sach - hanh ((trang va) or (tran van)) han tong thanh ((tra cau) OR (tra cuu))".
• Adding a wildcard symbol may retrieve word variants: theo chu sach - hanh ((trang va) or (tran van)) han tong thanh ((tra cau) OR (tra cuu))*.