Perhaps you should try some spelling variations:
nang thong » nang thuong, mang thong, nang trong
chieu sang » chieu sach, chieu xanh, hieu lang
quan trong » gian trong
hieu van » hieu va, thien van, lieu va
cong dan » cong san, cong tan, huong dan
than cau » toan cau, than cap, thanh chau
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sang) or (hieu van)) - nang thong quan trong cong dan ((than cau) or (phan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu van)) - nang thong quan trong cong dan ((than cau) OR (phan cau)).
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu van)) - nang thong quan trong cong dan ((than cau) or (phan cau))*.