Perhaps you should try some spelling variations:
tan thanh » tran thanh, tang thanh, toan thanh
thanh van » thanh san, thanh toan, thanh phan
sach moi » sach doi, sach hoi, sach bai
cuu cong » cua cong, thu cong, cac cong
cong moi » cong goi, cong mi, cong mot
moi dan » moi dang, hoi dan, doi dan
dan hoa » danh hoa, dan hoat, dan khoa
hoc vat » hoc va, hoc viet, thuc vat
vat hai » van hai, dat hai, gat hai
hai tan » hai van, hai quan

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 moi) or (bach mai)) tap, nghien cuu cong moi dan hoa hoc vat hai tan thanh van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach moi) OR (bach mai)) tap, nghien cuu cong moi dan hoa hoc vat hai tan thanh van.
• Adding a wildcard symbol may retrieve word variants: su ((sach moi) or (bach mai)) tap, nghien cuu cong moi dan hoa hoc vat hai tan thanh van*.