Perhaps you should try some spelling variations:
thuc khong » thuoc khong, phuc khong, thu khong
khong cong » thong cong, khong cang, chong cong
cong thuc » cong tac
toc hieu » doc hieu, hoc thieu, thuc hieu
cong dat » cong dan, dong dat, cong da
dat than » dat thanh, dan than, dat khanh
than cap » khan cap, thanh lap, thanh cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc hieu) or (toc thieu)) cach - thanh cong thuc khong cong dat than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc hieu) OR (toc thieu)) cach - thanh cong thuc khong cong dat than cap*.