Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
thanh van » thanh san, thanh toan, thanh phan
van thanh » ban thanh, van tuan
cong moi » cong goi, cong mi, cong mot
cac cong » cua cong
toi tap » toi gap, toan tap, tong tap
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 van » thai van, ha van, hai tan
moi tap » moi tai
su sach » so sach, vu sach

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 tap) OR (toi tap)), nghien cac cong moi dan hoa hoc vat hai van thanh van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((moi tap) OR (toi tap)), nghien cac cong moi dan hoa hoc vat hai van thanh van".
• Adding a wildcard symbol may retrieve word variants: su sach ((moi tap) OR (toi tap)), nghien cac cong moi dan hoa hoc vat hai van thanh van*.