Perhaps you should try some spelling variations:
hoc khanh » hoc nhanh, hoc thanh, hoc hanh
khanh hoa » thanh hoa, hang hoa
thu sach » tu sach, thuat sach, thuoc sach
sach hoc » cach hoc, sach hoi, mach hoc
dai khoi » dai hoi, dai khoa, mai khoi
hoc dai » hoc dan
va phap » ban phap
mo hoc » mon hoc, co hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach hoc tap, nghien cuu mo hoc khanh hoa hoc dai khoi ((va phap) OR (va phat)) va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach hoc tap, nghien cuu mo hoc khanh hoa hoc dai khoi ((va phap) OR (va phat)) va".
• Adding a wildcard symbol may retrieve word variants: thu sach hoc tap, nghien cuu mo hoc khanh hoa hoc dai khoi ((va phap) OR (va phat)) va*.