Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
hoa nhanh » hoc nhanh, hoa thanh, hoa khanh
sach hoi » sach doi, sach moi, cach thoi
cong hoa » dong hoa, dong hoc, hang hoa
tu sach » thu sach, su sach, te sach
hoi tap » hoi dap, hoc tap, hoi tai
mai hoi » mai khoi, dai hoi, lai hoi
va luan » vay luan, van luan, va quan

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 hoi tap, nghien thu cong hoa nhanh ((khoa hoc) or (hoa hoc)) mai hoi va luan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoi tap, nghien thu cong hoa nhanh ((khoa hoc) OR (hoa hoc)) mai hoi va luan van.
• Adding a wildcard symbol may retrieve word variants: tu sach hoi tap, nghien thu cong hoa nhanh ((khoa hoc) or (hoa hoc)) mai hoi va luan van*.