Perhaps you should try some spelling variations:
sach hoc » cach hoc, sach hoi, mach hoc
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
cau nhan » chau nhan, cu nhan, cam nhan
tu sach » thu sach, su sach, te sach
hoc anh » hoc nganh, hoc nhanh, ngoc anh
anh hoa » anh khoa, danh hoa, hanh hoa
hoc xa » hoc ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach hoc tap, nghien cuu dong hoc anh hoa hoc xa hoi ((cau nhan) OR (ca nhan)) dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoc tap, nghien cuu dong hoc anh hoa hoc xa hoi ((cau nhan) OR (ca nhan)) dan".
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu dong hoc anh hoa hoc xa hoi ((cau nhan) OR (ca nhan)) dan*.