Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
hanh tang » hanh trang, anh tang, hanh mang
dung cong » dung trong
tang cua » mang cua, hang cua, tang luan
gian nan » gian dan, gian lan, giai nan
gian van » giang van, gian dan, gian lan

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