Perhaps you should try some spelling variations:
doanh hai » doanh tai, doan hai, doanh ha
van doanh » toan doanh, van dong, van thanh
thu sach » tu sach, thuat sach, thuoc sach
hieu ve » hieu va, hieu van
ty nang » ky nang, ty hang, ly nang
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, me hoi
ve cam » ve cham, ve cac, va cam
cam lo » nam lo, cam ly, cam o
lo van » le van, vo van, so van

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 ((ty nang) or (ty xang)) ((ma hoi) or (ma hoa)). hieu ve cam lo van doanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ty nang) OR (ty xang)) ((ma hoi) OR (ma hoa)). hieu ve cam lo van doanh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ((ty nang) or (ty xang)) ((ma hoi) or (ma hoa)). hieu ve cam lo van doanh hai cua tre*.