Perhaps you should try some spelling variations:
thanh le » thinh le, thanh ve, thanh de
thu sach » tu sach, thuat sach, thuoc sach
thanh te » thanh ve, thanh de, thanh tu
tang mai » tang ma, tang tai, lang mai
vu sach » vu bach, su sach, vu khach
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ky tang » ky nang, ky dang, kho tang
cam lo » nam lo, cam ly, cam o
ve cam » ve cham, ve cac, va cam
lo va » lo van, lao va, ly va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (thu sach)) ky tang mai hoi. hieu ve cam lo va ((thanh te) OR (thanh le)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (thu sach)) ky tang mai hoi. hieu ve cam lo va ((thanh te) OR (thanh le)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (thu sach)) ky tang mai hoi. hieu ve cam lo va ((thanh te) OR (thanh le)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (thu sach)) ky tang mai hoi. hieu ve cam lo va ((thanh te) OR (thanh le)) cua tre*.