Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ban hanh » ban hang
nang ma » tang ma, sang ma, nang cao
hoi cua » hoi chuc
ve cac » va cac, vien cac
y nang » ky nang, ly nang, v nang
ve cam » ve cham, va cam, ve cai
ma hoi » mai hoi, xa hoi, ma hoa
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 ma hoi. hieu ((ve cam) OR (ve cac)) duc ((ban hanh) or (gia thanh)) hoi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ma hoi. hieu ((ve cam) OR (ve cac)) duc ((ban hanh) OR (gia thanh)) hoi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang ma hoi. hieu ((ve cam) OR (ve cac)) duc ((ban hanh) or (gia thanh)) hoi cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ma hoi. hieu ((ve cam) OR (ve cac)) duc ((ban hanh) or (gia thanh)) hoi cua te*.