Perhaps you should try some spelling variations:
thieu manh » hieu manh, tien manh, trieu minh
hoc thieu » toc thieu, hoc hien
tranh cua » doanh cua, manh cua
dang nong » dang cong, hang nong, dang hoang
tang nong » hang nong, tang dong, tang mong
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 manh - canh tranh cua ((dang nong) OR (tang nong)) dan ((phan cau) OR (phan dau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu manh - canh tranh cua ((dang nong) OR (tang nong)) dan ((phan cau) or (phan dau))~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu manh - canh tranh cua ((dang nong) OR (tang nong)) dan ((phan cau) or (phan dau))*.