Perhaps you should try some spelling variations:
nganh nang » nganh nong, ganh nang, ngan hang
mach hoc » cach hoc, dich hoc, anh hoc
dong hoc » dong co
dong luc » nang luc
nang hoc » nang doc, nang luc, hang hoa
hat nhan » ca nhan, tao nhan, van nhan
nhan dan » phan dau, gian dan, nhan tai
tu mach » tu cach, tu manh, tu hach
hoc tai » hoc dai, hoc tap, hoc bai
hoa hat » hoa chat, hoa phat, hoa nhat

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu mach hoc tai, nghien cuu ((dong hoc) or (dong luc)) nganh nang hoc ma hoa hat nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu mach hoc tai, nghien cuu ((dong hoc) OR (dong luc)) nganh nang hoc ma hoa hat nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tai, nghien cuu ((dong hoc) or (dong luc)) nganh nang hoc ma hoa hat nhan dan*.