Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu cach » hieu cac, chieu sach, hieu ca
cac nhung » cac chung, cam nhung, cac phuong
cong toan » cong tan, cong hoan, cong tuan
nhanh cay » nhanh ha, nhanh va, hanh cac
nhanh bac » nhanh ha, nhanh va
toc hieu » toc thieu, doc hieu, hoc thieu
cong cac » cuong cac, cong tac, cong cau

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 cach - thanh cong cac nhung cong toan ((nhanh cay) or (nhanh bac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc hieu cach - thanh cong cac nhung cong toan ((nhanh cay) OR (nhanh bac)).
• Adding a wildcard symbol may retrieve word variants: toc hieu cach - thanh cong cac nhung cong toan ((nhanh cay) or (nhanh bac))*.