Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
cong thanh » dong thanh, cong trinh, cong tan
hieu lang » chieu sang, nhieu tang, hieu van
canh binh » manh binh, canh tinh, thanh binh
vat nhung » va nhung, vap nhung, vai nhung
binh vat » sinh vat, binh va, binh van
cong dan » cong san, cong tan, huong dan
chan cau » phan cau, can cau, chinh cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: nho ((hieu lang) OR (hieu quang)) - canh binh vat nhung ((cong dan) or (cong thanh)) chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nho ((hieu lang) OR (hieu quang)) - canh binh vat nhung ((cong dan) OR (cong thanh)) chan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nho ((hieu lang) OR (hieu quang)) - canh binh vat nhung ((cong dan) or (cong thanh)) chan cau".
• Adding a wildcard symbol may retrieve word variants: nho ((hieu lang) OR (hieu quang)) - canh binh vat nhung ((cong dan) or (cong thanh)) chan cau*.