Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ban hanh » ban hang
nang mai » nang ma, nang tai, lang mai
va thanh » gia thanh, ban thanh, va tinh
mai hoi » mai khoi, dai hoi, lai hoi
hai cua » thai cua, dai cua, hoi cua
ve cac » va cac, vien cac
y nang » ky nang, ly nang, v nang
ve cam » ve cham, va cam, ve cai
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y nang mai hoi. hieu ((ve cam) or (ve cac)) duc ((ban hanh) or (va thanh)) hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang mai hoi. hieu ((ve cam) OR (ve cac)) duc ((ban hanh) OR (va thanh)) hai cua te.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang mai hoi. hieu ((ve cam) or (ve cac)) duc ((ban hanh) or (va thanh)) hai cua te*.