Perhaps you should try some spelling variations:
thanh trung » thanh tung
thiet danh » thien danh, thien anh, tiep danh
thien dang » thien bang, thien danh, thien nang
dung cong » dung trong
trung va » truong va, trang va, trung ha
cong anh » cong danh, dong anh, hong anh
anh juan » anh tuan, anh quan, anh xuan
juan cao » quang cao, toan cao, quan cau
va dung » van dung, va duong, vat dung

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 danh) OR (thien dang)) - thanh trung va dung cong anh juan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet danh) OR (thien dang)) - thanh trung va dung cong anh juan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet danh) OR (thien dang)) - thanh trung va dung cong anh juan cao*.