Perhaps you should try some spelling variations:
thanh te » thanh ve, thanh de, thanh le
thu sach » tu sach, thuat sach, thuoc sach
kho tang » cao tang
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
tang ma » mang may, tang van
ma hoi » mai hoi, xa hoi, ma hoa
lao va » tao va, cao va, bao va
te cua » tue cua, le cua, de cua
ve cam » ve cham, ve cac, va cam
lo va » lo van, ly va, le 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)) kho tang ma hoi. hieu ve cam ((lo va) OR (lao va)) thanh te cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (thu sach)) kho tang ma hoi. hieu ve cam ((lo va) OR (lao va)) thanh te cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (thu sach)) kho tang ma hoi. hieu ve cam ((lo va) OR (lao va)) thanh te cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (thu sach)) kho tang ma hoi. hieu ve cam ((lo va) OR (lao va)) thanh te cua tre*.