Perhaps you should try some spelling variations:
khong chuc » khong thuoc, cong chuc, hong phuc
duc nhanh » duc thanh, duc hanh, doc nhanh
nhung hoc » chung hoc, nhung goc, khung hoc
sach hoc » cach hoc, sach hoi, mach hoc
cuu cong » cua cong, thu cong, cac cong
cong duc » cong suc, hong duc, cong dac
phan van » pham van, thanh van, luan van
tu sach » thu sach, su sach, te sach
va phan » van phan, va phat, va phap

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 cong duc nhanh ((khong chuc) or (nhung hoc)) xa hoi va phan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cuu cong duc nhanh ((khong chuc) OR (nhung hoc)) xa hoi va phan van.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu cong duc nhanh ((khong chuc) or (nhung hoc)) xa hoi va phan van*.