Perhaps you should try some spelling variations:
dong phuong » duong phuong, dung phuong, dong huong
cong phuong » cong thuong, cong huong, hong phuong
hieu quang » thieu quang, hieu quan, hieu qua
hieu lang » chieu sang, nhieu tang, hieu van
hanh hang » thanh hang, hang hang, hanh han
trinh han » trinh quan
hang cua » mang cua, hang ca, huong cua
han ban » hang ban, van ban, can ban

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

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