Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nghien huu » nghien cuu, nguyen huu, nhiem huu
sach hoc » cach hoc, sach hoi, mach hoc
tung hoc » trung hoc, tuong hoc, dung hoc
hong doc » chong doc, huong doi, nang doc
hong duc » dang duc, ton duc
phat van » pham van, phan van, phap van

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 huu tung hoc pho ((hong doc) or (hong duc)) xa hoi va phat van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach hoc tap, nghien huu tung hoc pho ((hong doc) OR (hong duc)) xa hoi va phat van.
• Adding a wildcard symbol may retrieve word variants: thuat sach hoc tap, nghien huu tung hoc pho ((hong doc) or (hong duc)) xa hoi va phat van*.