Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
thieu xanh » chieu xanh, hieu manh, thien anh
cong ngang » cong nhan, cong quang, cong lang
hieu lang » chieu sang, hieu quang, nhieu tang
hanh tang » hanh trang, anh tang, hanh mang
toan cao » toan tap
toan ban » van ban
tang va » trang va, tang van, thang va

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 lang)) - hanh tang va nhung cong ngang ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (hieu lang)) - hanh tang va nhung cong ngang ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (hieu lang)) - hanh tang va nhung cong ngang ((toan cao) or (toan ban))*.