Perhaps you should try some spelling variations:
thiet hach » thien hach, thuyet hach, chiet tach
thiet hai » thiet bi, thi hai, thien tai
tranh cua » doanh cua, manh cua
dang dong » dang cong, dung dong, dan dong
cua dang » cua cong, cua ban
dong dan » dong danh, duong dan, dong san
dan toan » van toan, dan than, manh toan
toan tap » toan ban

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) OR (thiet hai)) - canh tranh cua dang dong dan toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet hach) OR (thiet hai)) - canh tranh cua dang dong dan toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet hach) OR (thiet hai)) - canh tranh cua dang dong dan toan tap*.