Perhaps you should try some spelling variations:
thieu xanh » thien anh, thien danh
chieu xanh » chieu sach, chieu sang, chieu tinh
tran hoang » tran hong, quan hoang, tran quang
hieu manh » hieu nganh, dieu hanh, hien hanh
hoang van » hang va
dang cong » dung cong
van dang » van dong, van dung, van nang
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than cau » toan cau, phan cau, than cap

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 (((hieu manh) OR (chieu xanh)))) - tran hoang van dang cong tan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (((hieu manh) OR (chieu xanh)))) - tran hoang van dang cong tan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (((hieu manh) OR (chieu xanh)))) - tran hoang van dang cong tan than cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (((hieu manh) OR (chieu xanh)))) - tran hoang van dang cong tan than cau*.