Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
lanh minh » lanh manh, thanh minh, tranh minh
lanh dinh » anh dinh, hanh dinh, thanh dinh
va thong » va thuong, va phuong, he thong
cong van » cong vang, cong san, song van
phan cau » phan cac, phan tu, phan lap
phan dau » phan tu, hang dau

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - ((lanh minh) OR (lanh dinh)) va thong cong van ((phan cau) OR (phan dau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - ((lanh minh) OR (lanh dinh)) va thong cong van ((phan cau) or (phan dau))~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - ((lanh minh) OR (lanh dinh)) va thong cong van ((phan cau) or (phan dau))*.