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 tac » cong ty
tac than » tac thanh, tam than, tac nhan
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 tac than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - than ((sinh cua) OR (sinh va)) thuong cong tac than tap.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - than ((sinh cua) or (sinh va)) thuong cong tac than tap*.