Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
thong cong » trong cong, tong cong, thong thong
tang thanh » dang thanh, trung thanh, hoang thanh
hoc thiet » hoc thieu, hoc thuyet, hoc hien
canh manh » lanh manh, canh tranh, cach mang
dung cong » dung trong
thanh chu » thanh chau, thanh cha, thanh thu
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 tach - canh manh cua ((dung cong) or (thong cong)) tang thanh chu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - canh manh cua ((dung cong) OR (thong cong)) tang thanh chu.
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - canh manh cua ((dung cong) or (thong cong)) tang thanh chu*.