Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, thien anh, thien danh
hieu manh » chieu xanh, hieu nganh, dieu hanh
trang cua » tang cua, trung cua, thang cua
tranh cua » doanh cua, manh cua
dung cong » dung trong
tap quang » tap quan, tac quang, tai quang
quang cao » nang cao, quang nam
cong tap » cuong tap, cong tac, cong tan

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)) - hanh ((trang cua) or (tranh cua)) dung cong tap quang cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (hieu manh)) - hanh ((trang cua) OR (tranh cua)) dung cong tap quang cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) OR (hieu manh)) - hanh ((trang cua) or (tranh cua)) dung cong tap quang cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) OR (hieu manh)) - hanh ((trang cua) or (tranh cua)) dung cong tap quang cao*.