Perhaps you should try some spelling variations:
khanh luan » khanh thuan, doanh luan, hang luan
su triet » su viet, su tien, ve triet
thuc xay » thuc day, tuc xay, thuat xay
nang ma » tang ma, sang ma, nang cao
hieu le » hieu ve, hieu he, hieu ly
thuc xa » tuc xa, thuc va, thuc ha
vu sach » vu bach, vu khach
luan su » quan su, luat su, luan san
su sach » so sach
le nam » ly nam, he nam, le na
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu sach)) y nang ma hoa. hieu le nam ((thuc xa) OR (thuc xay)) khanh luan su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) y nang ma hoa. hieu le nam ((thuc xa) OR (thuc xay)) khanh luan su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) y nang ma hoa. hieu le nam ((thuc xa) OR (thuc xay)) khanh luan su triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) y nang ma hoa. hieu le nam ((thuc xa) OR (thuc xay)) khanh luan su triet*.