Perhaps you should try some spelling variations:
thanh trung » thanh tung
thiet hach » thien hach, thuyet hach, thiet hai
trung quan » truong quan, trong quan, trung tuan
quan trong » gian trong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
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: hoc thiet hach - thanh trung quan trong cong dan chan cau~.
• Adding a wildcard symbol may retrieve word variants: hoc thiet hach - thanh trung quan trong cong dan chan cau*.