Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, nhung don
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
chinh can » chinh ca, chinh ban, chinh ngan
chinh cau » chinh chau, chinh ca, chinh tai
hang cong » dang cong, hang nong, bang cong
toan ban » van ban

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 ((chinh can) OR (chinh cau)) ((nhung cong) or (hang cong)) tinh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - hanh ((chinh can) OR (chinh cau)) ((nhung cong) OR (hang cong)) tinh toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - hanh ((chinh can) OR (chinh cau)) ((nhung cong) or (hang cong)) tinh toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - hanh ((chinh can) OR (chinh cau)) ((nhung cong) or (hang cong)) tinh toan ban*.