Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
thu sach » tu sach, thuat sach, thuoc sach
cham cuc » cham cuu, pham cuc, pham chuc
doanh di » danh di, doanh dich, doanh tai
tay lang » tai lang, tay tang, tay quang
ky tang » ky nang, ky dang, kho tang
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
cuc van » chuc van, cuu van, cac van
ky lang » ky nang, ky dang
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((((ky lang) or (tay lang))) or (ky tang)) xa hoi. hieu ve cham cuc van doanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((((ky lang) OR (tay lang))) OR (ky tang)) xa hoi. hieu ve cham cuc van doanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ((((ky lang) or (tay lang))) or (ky tang)) xa hoi. hieu ve cham cuc van doanh di cua tre*.