Perhaps you should try some spelling variations:
thuyet hach » thuyet mach, thuyet xac, thuyet cac
thiet hach » thien hach, thiet hai, chiet tach
cua phuong » cuu phuong, cuc phuong, luan phuong
cua truong » cua trung, xuan truong, cac truong
cong vang » cong lang, cong quang, cong ngang
vang tuan » van tuan, vong tuan, quang tuan
tuan cau » toan cau, quan cau, tuan cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((thiet hach) OR (thuyet hach)) - canh tranh ((cua phuong) or (cua truong)) cong vang tuan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((thiet hach) OR (thuyet hach)) - canh tranh ((cua phuong) OR (cua truong)) cong vang tuan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((thiet hach) OR (thuyet hach)) - canh tranh ((cua phuong) or (cua truong)) cong vang tuan cau".
• Adding a wildcard symbol may retrieve word variants: ho ((thiet hach) OR (thuyet hach)) - canh tranh ((cua phuong) or (cua truong)) cong vang tuan cau*.