Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
thanh tung » thanh cong
tuan thong » tran thong, tuan phong, xuan thong
hoc thieu » toc thieu, hoc hien
cong toan » cong tan, cong hoan, cong tuan
phan cau » phan cac, phan tu, phan lap
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu xanh - thanh tung ((tuan thong) or (toan thong)) cong toan ((phan cau) OR (phan dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - thanh tung ((tuan thong) OR (toan thong)) cong toan ((phan cau) OR (phan dau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - thanh tung ((tuan thong) or (toan thong)) cong toan ((phan cau) OR (phan dau))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - thanh tung ((tuan thong) or (toan thong)) cong toan ((phan cau) OR (phan dau))*.