Perhaps you should try some spelling variations:
nganh dang » ngan hang, nhan dang, nganh cong
dang thuoc » dung thuoc
gian lang » gian dan
sach hoc » cach hoc, sach hoi, mach hoc
dong hoc » dong co, dong luc
thuoc xa » thuoc ma, thuoc va, thuoc la
van gian » van giang, dan gian, van giao
tu sach » thu sach, su sach, te sach
hoc tai » hoc dai, hoc tap, hoc bai
mon hoc » toan hoc
hoi van » hoi va, hoi dan, hai van

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 tai, nghien cuu ((mon hoc) or (dong hoc)) nganh dang thuoc xa hoi van gian lang~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tai, nghien cuu ((mon hoc) OR (dong hoc)) nganh dang thuoc xa hoi van gian lang.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tai, nghien cuu ((mon hoc) or (dong hoc)) nganh dang thuoc xa hoi van gian lang*.