Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
truong ca » truong cao, truong va, trong ca
dung cong » dung trong
chi sach » chinh sach, chieu sach, co sach
cong san » cong tac
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi sach - hanh ((truong ca) or (trung tuan)) dung cong san ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi sach - hanh ((truong ca) OR (trung tuan)) dung cong san ((toan cau) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: doi chi sach - hanh ((truong ca) or (trung tuan)) dung cong san ((toan cau) or (toan tap))*.