Perhaps you should try some spelling variations:
cach thoi » cac thoi, cach thuc, cach noi
thuoc ban » thuoc tan, thuoc dang, thu ban
thoi tap » toi tap, hoc tap, thoi dai
cuu long » cuu cong, cuu tong, cuu nang
thuc dan » thuc hanh, hoc dan, thuc vat
phan dan » phan dang, phan dau, nhan dan
su cach » su sach, tu cach, su cac
va phan » van phan, va phat, va phap
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su cach thoi tap, nghien cuu long ((thuoc ban) or (thuc dan)) hoa hoc ma hoi va phan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cach thoi tap, nghien cuu long ((thuoc ban) OR (thuc dan)) hoa hoc ma hoi va phan dan.
• Adding a wildcard symbol may retrieve word variants: su cach thoi tap, nghien cuu long ((thuoc ban) or (thuc dan)) hoa hoc ma hoi va phan dan*.