Perhaps you should try some spelling variations:
thanh thang » nhanh thang, thanh thanh, thanh hang
thiet tach » chiet tach, thien hach
thuat tach » thuat sach, thuat mach, thuat tac
nhung cong » dung cong, thong cong, hang cong
thang va » hang va, trang va, thong va
cong san » cong tac
juan cao » quang cao, toan cao, juan a
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: hoc ((thiet tach) OR (thuat tach)) - thanh thang va nhung cong san ((juan cao) or (quan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet tach) OR (thuat tach)) - thanh thang va nhung cong san ((juan cao) OR (quan cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet tach) OR (thuat tach)) - thanh thang va nhung cong san ((juan cao) or (quan cau))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet tach) OR (thuat tach)) - thanh thang va nhung cong san ((juan cao) or (quan cau))*.