Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hanh trinh » canh tranh, hanh chinh
hoc thieu » toc thieu, hoc hien
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
trinh va » trinh van, trinh vat, trinh ve
toan cao » toan tap
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 trinh va ((hang cong) or (dang cong)) dan ((toan cao) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - hanh trinh va ((hang cong) OR (dang cong)) dan ((toan cao) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - hanh trinh va ((hang cong) or (dang cong)) dan ((toan cao) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - hanh trinh va ((hang cong) or (dang cong)) dan ((toan cao) OR (toan ban))*.