Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
nghien cac » nghiep cach, nghien cuu, nghiep cay
van thanh » ban thanh, van tuan
cong mot » cong dot, trong mot, cong mong
cac cong » cua cong
toi tap » toi gap, toan tap, tong tap
mot dan » mat dan, moi dan, mot lan
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 mot dan hoa hoc vat hai van thanh phan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((moi tap) OR (toi tap)), nghien cac cong mot dan hoa hoc vat hai van thanh phan.
• Adding a wildcard symbol may retrieve word variants: su sach ((moi tap) or (toi tap)), nghien cac cong mot dan hoa hoc vat hai van thanh phan*.