Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
thanh tung » thanh cong
dung cong » dung trong
khoan cam » khoa cam, khoan va, phan cam
thanh lap » thanh san, phan lap, thanh hai
tung cua » trung cua, tuong cua, dung cua
cua dung » cua dang, cua dong, qua dung
cong dan » cong san, cong tan, huong dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien nhanh - thanh tung cua dung cong dan ((khoan cam) or (thanh lap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien nhanh - thanh tung cua dung cong dan ((khoan cam) OR (thanh lap)).
• Adding a wildcard symbol may retrieve word variants: hoc hien nhanh - thanh tung cua dung cong dan ((khoan cam) or (thanh lap))*.