Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
danh tuan » anh tuan, manh tuan, danh thanh
thai danh » thai thanh, thai binh, thai den
tuan van » luan van, tran van, tan van
dan hoat » van hoa, dan hoc, danh hoa
vat thai » van thai, vat tai, chat thai
hoat hoc » hoa hoc, hoat ho, khoa hoc
cong doi » vong doi, cong dot, cong goi
sach moi » sach hoi, bach mai, sach bai
cac cong » cua cong
sach doi » sach hoi, sach dao, sach bai
doi dan » hoi dan, doi ban, doi dau
hoc vat » hoc va, hoc viet, thuc vat

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