Perhaps you should try some spelling variations:
phan chong » phan cong, phan hong, phap chong
chong hoc » chung hoc, chong doc, thong hoc
sach hoc » cach hoc, sach hoi, mach hoc
cuu tong » cuu cong, cuu tinh, huu tung
tong hoc » tuong hoc, thong hoc, trong hoc
hoc phan » hoc dan, hoc pho
nhan dan » phan dau, gian dan, nhan tai
tu sach » thu sach, su sach, te sach
nhan va » nhan tai, nhan tao, phan van
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: tu sach hoc tap, nghien cuu tong hoc phan chong hoc xa hoi va ((nhan va) OR (nhan dan))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoc tap, nghien cuu tong hoc phan chong hoc xa hoi va ((nhan va) OR (nhan dan))".
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu tong hoc phan chong hoc xa hoi va ((nhan va) OR (nhan dan))*.