Perhaps you should try some spelling variations:
vay doanh » van doanh, ly doanh, voi doanh
va doanh » van doanh, va danh, hoa doanh
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
dan cua » dan ca, ban cua, dai cua
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
ve cam » ve cham, ve cac, va cam
cua te » cua tu

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 ky ((nang ma) or (mang may)) hoi. hieu ve cam xuc ((va doanh) OR (vay doanh)) dan cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang ma) OR (mang may)) hoi. hieu ve cam xuc ((va doanh) OR (vay doanh)) dan cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang ma) or (mang may)) hoi. hieu ve cam xuc ((va doanh) OR (vay doanh)) dan cua te*".