Perhaps you should try some spelling variations:
thanh tung » thanh cong
hoac thong » hoa thong, hoac khong, hoc thong
hieu xanh » chieu xanh, hieu manh, hieu nganh
tung hoac » trung hoc, trung hoa, dung hoc
thong dan » thong van, tuong dan, thong den
doc hieu » toc thieu, hoc thieu, hoc hien
chan cau » phan cau, chinh cau, nhanh cau
can cau » van cau, ban cau, cac cau
ca cau » cua cau, cac cau, ca cac

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 - thanh tung hoac thong thong dan ((chan cau) or (((can cau) or (ca cau))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - thanh tung hoac thong thong dan ((chan cau) OR (((can cau) OR (ca cau)))).
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - thanh tung hoac thong thong dan ((chan cau) or (((can cau) or (ca cau))))*.