Perhaps you should try some spelling variations:
nhanh chong » khanh phong
sach hoc » cach hoc, sach hoi, mach hoc
cuu dong » cuu cong, cuu tong, cuu long
dong luc » nang luc
gian dan » gian lang
tu sach » thu sach, su sach, te sach
hoi dan » hoa dan, hoc dan, hoi dap
ma hoi » mai hoi, xa hoi, ma hoa

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 dong luc ((nhanh chong) OR (thanh cong)) hoc ma hoi dan gian dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoc tap, nghien cuu dong luc ((nhanh chong) OR (thanh cong)) hoc ma hoi dan gian dan".
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu dong luc ((nhanh chong) OR (thanh cong)) hoc ma hoi dan gian dan*.