Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hoc thieu » toc thieu, hoc hien
trinh cua » tinh cua, trinh luat, trinh quan
cua thong » cua thuong, cua khong, cua tong
cong vang » cong quang, cong ngang, cong san
cong lang » cong luong, cong quang, cong ngang
ho chieu » theo chieu, doi chieu, mot chieu
chat van » chat va, chat ban, chat ran

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 - hanh trinh cua thong ((cong vang) OR (cong lang)) chat van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) sach - hanh trinh cua thong ((cong vang) OR (cong lang)) chat van.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (hoc thieu)) sach - hanh trinh cua thong ((cong vang) OR (cong lang)) chat van".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoc thieu)) sach - hanh trinh cua thong ((cong vang) OR (cong lang)) chat van*.