Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hieu xanh » chieu xanh, hieu manh, hieu nganh
thang cua » thong cua, hang cua, than cua
trung cua » truong cua, trung tuan, trung cap
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong san, cong tan, huong dan
dan phan » doan phan, dan chan, van phan
phan cau » phan dau, phan cac, phan tu

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 xanh - hanh ((thang cua) or (trung cua)) thong cong dan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh ((thang cua) OR (trung cua)) thong cong dan phan cau*.