Perhaps you should try some spelling variations:
thanh tung » thanh cong
nong thong » nong thon, dong thong, cong thong
hieu lang » chieu sang, hieu quang, nhieu tang
thong dan » thong van, tuong dan, thong den
tung cua » trung cua, tuong cua, dung cua
cua nong » cua cong, cuu nong, cua dong
than cap » thanh lap, thanh cac, than cua
khan cap » khan ap, khoan cam, phan cac
ho hieu » ho chieu, hoi hieu, nho hieu

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 lang - thanh tung cua nong thong dan ((than cap) or (khan cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - thanh tung cua nong thong dan ((than cap) OR (khan cap)).
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - thanh tung cua nong thong dan ((than cap) or (khan cap))*.