Perhaps you should try some spelling variations:
vay doanh » van doanh, voi doanh, von doanh
cua triet » cua viet, su triet, va triet
qua chao » qua cham, qua cho, qua khao
ly doanh » ly anh
tu sach » thu sach, su sach, tu cach
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
ca cua » co cua

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) or (te sach)) y nang ma hoa. hieu qua chao xu ((vay doanh) OR (ly doanh)) ca cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y nang ma hoa. hieu qua chao xu ((vay doanh) OR (ly doanh)) ca cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) y nang ma hoa. hieu qua chao xu ((vay doanh) OR (ly doanh)) ca cua triet*".