Perhaps you should try some spelling variations:
cong thang » cong thanh, cang thang, cung thang
cong thong » cong thuong, cong trong, dong thong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
canh manh » lanh manh, canh tranh, cach mang
cua nhung » va nhung
thanh chu » thanh chau, thanh cha, thanh thu
ho chieu » theo chieu, hoc thieu, doi chieu
manh cua » doanh cua, ban cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thiet) or (ho chieu)) tach - canh manh cua nhung ((cong thang) OR (cong thong)) thanh chu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (ho chieu)) tach - canh manh cua nhung ((cong thang) OR (cong thong)) thanh chu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thiet) or (ho chieu)) tach - canh manh cua nhung ((cong thang) OR (cong thong)) thanh chu".
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) or (ho chieu)) tach - canh manh cua nhung ((cong thang) OR (cong thong)) thanh chu*.