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