Perhaps you should try some spelling variations:
thiet hach » thien hach, thuyet hach, thiet hai
hoc thiet » hoc thieu, hoc thuyet, hoc hien
tranh cua » doanh cua, manh cua
hang cong » dang cong, hang nong, bang cong
manh toan » thanh toan, anh tuan, tinh toan
cua hang » cua dang, cua nhung, cua cong
dan than » dan chan, ban than, van than

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 hach - canh tranh cua hang cong ((manh toan) or (dan than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet hach - canh tranh cua hang cong ((manh toan) OR (dan than)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc thiet hach - canh tranh cua hang cong ((manh toan) or (dan than)) cao*.