Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
tranh cua » doanh cua, manh cua
trung cua » truong cua, trung tuan, trung cap
doc hieu » toc thieu, hoc thieu
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) OR (hoc hien)) xanh - hanh ((tranh cua) or (trung cua)) thong cong dan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (hoc hien)) xanh - hanh ((tranh cua) OR (trung cua)) thong cong dan phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) OR (hoc hien)) xanh - hanh ((tranh cua) or (trung cua)) thong cong dan phan cau".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) OR (hoc hien)) xanh - hanh ((tranh cua) or (trung cua)) thong cong dan phan cau*.