Perhaps you should try some spelling variations:
trang tuan » tran tuan, trung tuan, trong tuan
hoa thiet » hoc thiet, toan thiet, hoa viet
trang qua » trong qua, trong quan, trung quan
dung cong » dung trong
cong danh » cuong danh, cong dan, cong thanh
danh quan » doanh quan, dan quan, anh quan
ho thiet » hoc thiet, so thiet, hoc thieu
quan cau » quang cao, toan cau, quan ha

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoa thiet) or (ho thiet)) tach - hanh ((trang qua) OR (trang tuan)) dung cong danh quan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoa thiet) OR (ho thiet)) tach - hanh ((trang qua) OR (trang tuan)) dung cong danh quan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoa thiet) or (ho thiet)) tach - hanh ((trang qua) OR (trang tuan)) dung cong danh quan cau".
• Adding a wildcard symbol may retrieve word variants: ((hoa thiet) or (ho thiet)) tach - hanh ((trang qua) OR (trang tuan)) dung cong danh quan cau*.