Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
quang tuan » quang thanh, quan luan, quang cua
soc thiet » hoc thiet, so thiet, toc thieu
tung tuan » trung tuan, hung tuan, trang tuan
thanh lap » thanh san, phan lap, thanh hai
cong son » cong so, dong son, cong lon
cong san » cong tac

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

• Performing a fuzzy search may retrieve terms with similar spellings: soc thiet tach - thanh ((tung tuan) OR (quang tuan)) dung ((cong son) or (cong san)) thanh lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: soc thiet tach - thanh ((tung tuan) OR (quang tuan)) dung ((cong son) OR (cong san)) thanh lap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "soc thiet tach - thanh ((tung tuan) OR (quang tuan)) dung ((cong son) or (cong san)) thanh lap".
• Adding a wildcard symbol may retrieve word variants: soc thiet tach - thanh ((tung tuan) OR (quang tuan)) dung ((cong son) or (cong san)) thanh lap*.