Perhaps you should try some spelling variations:
vay doanh » van doanh, ly doanh, voi doanh
doanh cua » doanh luan
toc sach » hoc sach, doc sach, thuoc sach
qua khao » qua khai, qua kho, luan khao
tu sach » thu sach, su sach, tu cach
nang ma » tang ma, sang ma, nang cao
khao xu » chao xu, khao cuu
cua cua » cua chua, ca cua, qua cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
xu vay » tu vay, xu van

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) OR (toc sach)))) y nang ma hoa. hieu qua khao xu vay doanh cua cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (((te sach) OR (toc sach)))) y nang ma hoa. hieu qua khao xu vay doanh cua cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (((te sach) OR (toc sach)))) y nang ma hoa. hieu qua khao xu vay doanh cua cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (((te sach) OR (toc sach)))) y nang ma hoa. hieu qua khao xu vay doanh cua cua tre*.