Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
hanh hinh » hanh chinh, hanh tinh, hanh dinh
tang nong » hang nong, tang dong, tang mong
hinh cua » chinh cua, sinh cua, tinh cua
cua tang » cua dang, cua hang, ca tang
nong dan » cong dan, nong san, nguong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
hieu va » lieu va, hieu qua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu va) or (chieu sang)) - hanh hinh cua tang nong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu va) OR (chieu sang)) - hanh hinh cua tang nong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu va) or (chieu sang)) - hanh hinh cua tang nong dan toan cao*.