Perhaps you should try some spelling variations:
cong duong » cuong duong, cong dong, con duong
hop nhiet » hop nhieu, hoc thiet, hoa thiet
hoc nhiet » hoc thiet, hoc nghien, hoc hien
duong dan » duong dang, huong dan, duong van
nang cua » mang cua, hang cua, tang cua
nang dua » nang du, nang suat, nang quan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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: ((hop nhiet) OR (hoc nhiet)) nang - ganh ((nang cua) OR (nang dua)) cong duong dan than cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hop nhiet) OR (hoc nhiet)) nang - ganh ((nang cua) or (nang dua)) cong duong dan than cau~".
• Adding a wildcard symbol may retrieve word variants: ((hop nhiet) OR (hoc nhiet)) nang - ganh ((nang cua) or (nang dua)) cong duong dan than cau*.