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