Perhaps you should try some spelling variations:
cong cong » cong dong, trong cong, dung cong
ban thanh » ban hanh, ban hang
thanh tap » thanh lap, thanh tai, thanh tay
doc hieu » toc thieu, hoc thieu, hoc hien
chao chu » cho chu, cua chu, cao cho
tinh cua » trinh cua, sinh cua, tinh chat
cong ban » cong bang, cong san, cong tan

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 (chao chu)) xanh - hanh ((tinh cua) OR (trinh luat)) cong cong ban thanh tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) OR (chao chu)) xanh - hanh ((tinh cua) OR (trinh luat)) cong cong ban thanh tap".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) OR (chao chu)) xanh - hanh ((tinh cua) OR (trinh luat)) cong cong ban thanh tap*.