Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
thi giang » bai giang, thi nang, thoi gian
doanh hoa » doanh khoa, doanh hoan, danh hoa
sach thi » sach thu, sach tai, sach thieu
cong hoc » dong hoc, cong hoa, cong coc
hang hoa » hang khoa, thanh hoa, hang va
phan dau » phan tu, hang dau
tu sach » thu sach, su sach, te sach
xa phan » va phan, a phan, x phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach thi giang, nghien thu ((cong hoc) or (hang hoa)) doanh hoa hoc ma hoa xa phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi giang, nghien thu ((cong hoc) OR (hang hoa)) doanh hoa hoc ma hoa xa phan dau.
• Adding a wildcard symbol may retrieve word variants: tu sach thi giang, nghien thu ((cong hoc) or (hang hoa)) doanh hoa hoc ma hoa xa phan dau*.