Perhaps you should try some spelling variations:
cach thoi » cac thoi, cach thuc
danh nhan » doanh nhan, thanh nhan, benh nhan
cach noi » hanh noi, anh noi, cau noi
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
hoc hang » hoc hanh, hoc bang, hoc tang
hang hoa » hang khoa, thanh hoa, hang va
nha danh » nhat danh, nha doanh, nha lanh
nhan tai » hang tai, van tai, toan tai
hoc mat » hoc ma, hoc may, hoc mac
mat nha » mot nha, hat nha, mai nha

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((cach noi) or (cach thoi)) tap, nghien cuu cong hoc hang hoa hoc mat nha danh nhan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((cach noi) OR (cach thoi)) tap, nghien cuu cong hoc hang hoa hoc mat nha danh nhan tai.
• Adding a wildcard symbol may retrieve word variants: te ((cach noi) or (cach thoi)) tap, nghien cuu cong hoc hang hoa hoc mat nha danh nhan tai*.