Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
chieu sach » chinh sach, chiet tach, chieu sang
thanh hang » thanh hoang, thanh thang, tranh hang
hanh hang » hang hang, hanh han, hanh mang
bang cong » dang cong, bang song, hang cong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap
va bang » va nang, va lang, va ban

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) or (chieu sach)) - ((hanh hang) or (thanh hang)) va bang cong dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (chieu sach)) - ((hanh hang) OR (thanh hang)) va bang cong dan than cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (chieu sach)) - ((hanh hang) or (thanh hang)) va bang cong dan than cao*.