Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
hanh trinh » canh tranh, hanh chinh
luan chung » luan chinh
cua chung » cua nhung, luat chung, cua cong
cong tinh » cong trinh, cong vinh, long tinh
ho thiet » hoc thiet, hoa thiet, so thiet
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho thiet tach - hanh trinh ((luan chung) or (cua chung)) cong tinh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho thiet tach - hanh trinh ((luan chung) OR (cua chung)) cong tinh toan ban*.