Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
cong ban » cong bang, cong san, cong tan
ban toan » bai toan, ban than, van toan
toan ban » van ban
tung va » trung va, tuong va, vung 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) OR (dung va)) phuong cong ban toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - thanh ((tung va) OR (dung va)) phuong cong ban toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - thanh ((tung va) OR (dung va)) phuong cong ban toan ban*.