Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
bang cong » dang cong, bang song, hang cong
dan trinh » dan tinh, van trinh, hanh trinh
trinh ban » trinh han, trinh san, trinh dan
doc hieu » hoc thieu, hoc hien
dung cua » dung luan, dung cho
cong dan » cong san, cong tan, huong dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) OR (toc thieu)) xanh - thanh ((dung cua) or (trung tuan)) bang cong dan trinh ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) xanh - thanh ((dung cua) OR (trung tuan)) bang cong dan trinh ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) OR (toc thieu)) xanh - thanh ((dung cua) or (trung tuan)) bang cong dan trinh ban".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) OR (toc thieu)) xanh - thanh ((dung cua) or (trung tuan)) bang cong dan trinh ban*.