Perhaps you should try some spelling variations:
hieu sang » chieu sang, hieu quang, nhieu tang
hieu lang » chieu sang, hieu quang, nhieu tang
tang luan » dung luan
hang cong » dang cong, hang nong, bang cong
tang cua » mang cua, hang cua, thong cua
cong tao » cong tac, cong tan, cong bao
tao nhan » ca nhan, tue nhan, tri nhan
nhan cau » nhanh cau, phan cau, nhan sau

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu sang) OR (hieu lang)) - hanh ((tang cua) or (tang luan)) hang cong tao nhan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sang) OR (hieu lang)) - hanh ((tang cua) OR (tang luan)) hang cong tao nhan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu sang) OR (hieu lang)) - hanh ((tang cua) or (tang luan)) hang cong tao nhan cau".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sang) OR (hieu lang)) - hanh ((tang cua) or (tang luan)) hang cong tao nhan cau*.