Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
hoc nganh » hoc nhanh
gian lang » gian dan
sach hoc » cach hoc, sach hoi, mach hoc
cong hoc » dong hoc, cong hoa, cong coc
va gian » va gianh, van gian, va giai

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