Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
thanh toan » thanh hoa, thanh san, tinh toan
sach moi » sach doi, sach hoi, bach mai
cac cong » cua cong
cong goi » dong goi, cong noi, cong soi
thai van » thi van, thanh van, thai vung
su sach » so sach, vu sach
moi tap » moi tai, toi tap
goi dan » hoi dan, doi dan, gai dan
dan hoa » danh hoa, dan hoat, dan khoa
hoc vat » hoc va, hoc viet, thuc vat
hai van » ha van, hai tan, hao van

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