Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vi » hanh vi, thanh va, thanh ve
thu sach » thuat sach, thuoc sach, thu hoach
nang mai » nang ma, nang tai, lang mai
tu sach » su sach, te sach, tu cach
ve cham » va cham, ve chat, vu cham
xuc ban » duc ban, cuc ban, quoc ban
nha hoc » nha thuoc, khoa hoc, nha nuoc
mai hoi » mai khoi, dai hoi, lai hoi
y nang » ky nang, ly nang, v nang
vi nha » ve nha, va nha, li nha
ve cam » ve cac, va cam, ve cai

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) or (thu sach)) y nang mai hoi. hieu ((ve cam) or (ve cham)) xuc ban thanh vi nha hoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang mai hoi. hieu ((ve cam) OR (ve cham)) xuc ban thanh vi nha hoc.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y nang mai hoi. hieu ((ve cam) or (ve cham)) xuc ban thanh vi nha hoc*.