Perhaps you should try some spelling variations:
hoc khanh » hoc nhanh, hoc thanh, hoc hanh
khanh hoa » thanh hoa, hang hoa
mach hoc » cach hoc, dich hoc, anh hoc
cuu nang » chuc nang, cam nang, cuu van
nang hoc » nang doc, nang luc, dong hoc
tu mach » tu cach, tu manh, tu hach
va phan » van phan, va phap, hoa phan

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 tap, nghien cuu nang hoc khanh hoa hoc ma hoa ((va phan) OR (va phat)) van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu mach hoc tap, nghien cuu nang hoc khanh hoa hoc ma hoa ((va phan) OR (va phat)) van".
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cuu nang hoc khanh hoa hoc ma hoa ((va phan) OR (va phat)) van*.