Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
nganh hoa » thanh hoa, khanh hoa, danh hoa
sach toi » sach doi, sach hoi, sach moi
cuu dong » cuu cong, cuu tong, cuu long
co nganh » hoc nganh, cac nganh, moi nganh
phan tai » pham tai, nhan tai, phan thi
su sach » so sach, vu sach
toi tap » toi gap, toan tap, tong tap
ta hoc » tai hoc, tam hoc, te hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach toi tap, nghien cuu dong co nganh hoa hoc ((ta hoc) or (xa hoi)) thanh phan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach toi tap, nghien cuu dong co nganh hoa hoc ((ta hoc) OR (xa hoi)) thanh phan tai.
• Adding a wildcard symbol may retrieve word variants: su sach toi tap, nghien cuu dong co nganh hoa hoc ((ta hoc) or (xa hoi)) thanh phan tai*.