Perhaps you should try some spelling variations:
thai cua » than cua, tai cuc, tri cua
ban hang » ngan hang
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
ve cam » ve cham, ve cac, va cam

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 xa) or (nang ma)) hoi. hieu ve cam duc ((van hanh) or (ban hang)) thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang ma)) hoi. hieu ve cam duc ((van hanh) OR (ban hang)) thai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (nang ma)) hoi. hieu ve cam duc ((van hanh) or (ban hang)) thai cua tre*.