Perhaps you should try some spelling variations:
thanh trung » thanh tung
cong ngang » cong nhan, cong quang, cong lang
hoc thieu » toc thieu, hoc hien
trung dap » trung cap, trung dai, trung dam
dap thong » phap thong, khap thong, va thong
cong vang » cong lang, cong quang, cong san
ho chieu » theo chieu, doi chieu, mot chieu
thong tu » phong tuc, thong tin, thong ke

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (hoc thieu)) sach - thanh trung dap thong ((cong vang) OR (cong ngang)) thong tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) sach - thanh trung dap thong ((cong vang) OR (cong ngang)) thong tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (hoc thieu)) sach - thanh trung dap thong ((cong vang) OR (cong ngang)) thong tu".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoc thieu)) sach - thanh trung dap thong ((cong vang) OR (cong ngang)) thong tu*.