Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
cau thanh » cuu thanh, cac thanh, cau thang
thanh hoa » thanh pho
sach hoc » cach hoc, sach hoi, mach hoc
cong cau » cong cu, cong chuc, thong cau
cau nhan » chau nhan, ca nhan, cu nhan
nhan van » nhan dan, nhan va, phan van
xa hoa » xa khoa, xa hoi, va hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach hoc tap, nghien thu cong cau thanh hoa hoc ((xa hoa) or (ma hoa)) cau nhan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach hoc tap, nghien thu cong cau thanh hoa hoc ((xa hoa) OR (ma hoa)) cau nhan van.
• Adding a wildcard symbol may retrieve word variants: thuat sach hoc tap, nghien thu cong cau thanh hoa hoc ((xa hoa) or (ma hoa)) cau nhan van*.