Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
khong cong » thong cong, khong cang, chong cong
tranh cua » manh cua
doanh cua » doanh luan
cong thac » cong tac, cong thuc, cong thai
thac nang » thac quang, thich nang, thuat nang
ho chieu » hoc thieu, doi chieu, mot chieu

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 (theo chieu)) sach - canh ((tranh cua) or (doanh cua)) khong cong thac nang cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (theo chieu)) sach - canh ((tranh cua) OR (doanh cua)) khong cong thac nang cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (theo chieu)) sach - canh ((tranh cua) or (doanh cua)) khong cong thac nang cao".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (theo chieu)) sach - canh ((tranh cua) or (doanh cua)) khong cong thac nang cao*.