Perhaps you should try some spelling variations:
nhanh dong » hanh dong, nhanh chong, anh dong
sach hoc » cach hoc, sach hoi, mach hoc
dong hoc » dong co
dong luc » nang luc
dong suc » duong suc, dong su, cong suc
manh hoa » minh hoa, danh hoa, hanh hoa
tu sach » thu sach, su sach, te sach
va pham » van pham, va phat, va phap
hoa va » hoa van, hoa xa, hoa vo

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 hoc) OR (dong luc)) nhanh dong suc manh hoa va pham van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoc tap, nghien cuu ((dong hoc) OR (dong luc)) nhanh dong suc manh hoa va pham van".
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu ((dong hoc) OR (dong luc)) nhanh dong suc manh hoa va pham van*.