Perhaps you should try some spelling variations:
doc khanh » doc hanh, doc nhanh, doc thanh
khanh hoa » thanh hoa, hang hoa
mach hoc » cach hoc, dich hoc, anh hoc
cuu nang » chuc nang, cam nang, cao nang
phap van » pham van, phan van, phap han
tu mach » tu cach, tu manh, tu hach
va phap » va phat, ban phap
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 mach hoc tap, nghien ((cuu nang) OR (cuu van)) doc khanh hoa hoc ma hoi va phap van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu mach hoc tap, nghien ((cuu nang) OR (cuu van)) doc khanh hoa hoc ma hoi va phap van".
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien ((cuu nang) OR (cuu van)) doc khanh hoa hoc ma hoi va phap van*.