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