Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
hanh trinh » canh tranh
nhung cong » dung cong, thong cong, hang cong
hoa thiet » hoc thiet, toan thiet, hoa viet
cong dan » cong san, cong tan, huong dan
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau

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 tach - ((hanh trinh) or (hanh chinh)) va nhung cong dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoa thiet tach - ((hanh trinh) OR (hanh chinh)) va nhung cong dan chan cau*.