Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung tuan » trung thanh, trung tam, tran tuan
tuan trong » thuan trong, quan trong, tran trong
cong dan » cong san, cong tan, huong dan
than tap » han tap, phan tap, than cap
toan tap » toan ban
sinh » dinh, minh, kinh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sinh vat - thanh trung tuan trong cong dan ((than tap) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sinh vat - thanh trung tuan trong cong dan ((than tap) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: hoc sinh vat - thanh trung tuan trong cong dan ((than tap) or (toan tap))*.