Perhaps you should try some spelling variations:
tranh huong » trinh huong, thanh huong, thanh chuong
theo chieu » theo tieu, ho chieu, theo chu
cong thanh » cong trinh, cong tan, truong thanh
dong thanh » truong thanh
huong cua » dung cua
cua thong » cua thuong, cua khong, cua tong
nhan tap » nhan tai, nhan tao, han tap
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (doi chi)) sach - tranh huong cua thong ((cong thanh) OR (dong thanh)) nhan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (doi chi)) sach - tranh huong cua thong ((cong thanh) OR (dong thanh)) nhan tap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (doi chi)) sach - tranh huong cua thong ((cong thanh) OR (dong thanh)) nhan tap*".