Perhaps you should try some spelling variations:
cho thanh » cho phan, cuu thanh, dao thanh
tro thanh » thi thanh, tai thanh
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
luan nang » luan van, van nang, luan san
nang cong » nang song, dang cong, bang cong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van 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: cao ((cho thanh) OR (tro thanh)) - hanh tang luan nang cong dan than cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "cao ((cho thanh) OR (tro thanh)) - hanh tang luan nang cong dan than cau".
• Adding a wildcard symbol may retrieve word variants: cao ((cho thanh) OR (tro thanh)) - hanh tang luan nang cong dan than cau*.