Perhaps you should try some spelling variations:
phong thuc » phuong thuc, phong tuc, phong thuy
hoc khanh » hoc nhanh, hoc thanh, hoc hanh
sach hoc » cach hoc, sach hoi, mach hoc
cao phan » co phan, cho phan, cac phan
phan van » pham van, thanh van, luan van
tu sach » thu sach, su sach, te sach
cuu mot » cua mot, cuu mo, huu mot
mot hoc » mon hoc, mo hoc, mot goc
ma hoi » mai hoi, xa hoi, me hoi

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 mot hoc khanh phong thuc ((ma hoi) or (ma hoa)) cao phan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cuu mot hoc khanh phong thuc ((ma hoi) OR (ma hoa)) cao phan van.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu mot hoc khanh phong thuc ((ma hoi) or (ma hoa)) cao phan van*.