Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nghien huu » nghien cuu, nguyen huu, nhiem huu
phan hong » phan cong, pham hong, phan song
sach hoc » cach hoc, sach hoi, mach hoc
tung hoc » trung hoc, tuong hoc, dung hoc
hoc phan » hoc dan, hoc pho
phat van » pham van, phan van, phap van
doc xa » duoc xa, do xa, doc va
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: thuoc sach hoc tap, nghien huu tung hoc phan hong ((doc xa) OR (hoc xa)) hoi va phat van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach hoc tap, nghien huu tung hoc phan hong ((doc xa) OR (hoc xa)) hoi va phat van".
• Adding a wildcard symbol may retrieve word variants: thuoc sach hoc tap, nghien huu tung hoc phan hong ((doc xa) OR (hoc xa)) hoi va phat van*.