Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
dinh trong » sinh trong, chinh trong, dinh thuong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
cac trong » cac truong, cay trong, tac trong
cong san » cong tac
san than » sang than, san thanh, ban than
than cau » toan cau, phan cau, than cap

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 - dinh trong cac trong cong san than cau~.
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - dinh trong cac trong cong san than cau*.