Perhaps you should try some spelling variations:
suat phong » suat thong, xuat phuong, suot phuong
phong cong » phong chong, thong cong, chong cong
hieu lang » chieu sang, hieu quang, nhieu tang
doi hieu » doi chieu, doc hieu, doi hien
anh nang » ganh nang, anh bang, anh dang
cong dan » cong san, cong tan, huong dan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi hieu lang - anh nang suat phong cong dan ((toan cao) or (van ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - anh nang suat phong cong dan ((toan cao) OR (van ban)).
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - anh nang suat phong cong dan ((toan cao) or (van ban))*.