Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
tong thanh » thong thanh, trong thanh, dong thanh
thanh tra » thanh toan, thanh hoa
thu sach » tu sach, thuat sach, thu hoach
trang va » hang va
tran van » luan van
tra cau » tra sau, ta cau, tra cuu

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

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