Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
va doanh » van doanh, vay doanh, va danh
sach ky » sac ky, sach y, sach ty
tai cua » thai cua, tai cuc, tri cua
su pham » san pham
su cham » tu cham, vu cham, qua cham
nang xa » lang xa, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
cuu va » cuu van, cuu ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky ((nang xa) or (nang x)) hoi. hieu ((su cham) OR (su pham)) cuu va doanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky ((nang xa) OR (nang x)) hoi. hieu ((su cham) OR (su pham)) cuu va doanh tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky ((nang xa) or (nang x)) hoi. hieu ((su cham) OR (su pham)) cuu va doanh tai cua tre*".