Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
hieu lang » chieu sang, hieu quang, nhieu tang
sinh cua » manh cua, dinh cuu
cong san » cong tac
san than » sang than, san thanh, ban than
than tap » toan tap, han tap, phan tap
ho hieu » ho chieu, hoi hieu, nho hieu
sinh va » sinh vat, tinh va, dinh van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - than ((sinh cua) OR (sinh va)) thuong cong san than tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - than ((sinh cua) OR (sinh va)) thuong cong san than tap".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - than ((sinh cua) OR (sinh va)) thuong cong san than tap*.