Perhaps you should try some spelling variations:
lang chai » lang ha, lang cua, lang phi
chai hoi » chai thoi, cham hoi, chai khoa
va doanh » van doanh, vay doanh, va danh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao
luc va » duc va, tuc va, loc va

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 lang chai hoi. hieu ((ve cam) or (va cam)) luc va doanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang chai hoi. hieu ((ve cam) OR (va cam)) luc va doanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang chai hoi. hieu ((ve cam) or (va cam)) luc va doanh tai cua tre*.