Perhaps you should try some spelling variations:
thanh ve » hanh ve, thanh va, thanh vien
cua tre » cua te, cuu tre, cua triet
tu sach » thu sach, su sach, te sach
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
hieu ve » hieu va, hieu van
lao va » tao va, cao va, bao va
ve cua » le cua, de cua, te cua
ma hoi » mai hoi, xa hoi, ma hoa
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 bach) or (tu sach)) ky tang ma hoi. hieu ve cam ((lo va) or (lao va)) thanh ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu bach) OR (tu sach)) ky tang ma hoi. hieu ve cam ((lo va) OR (lao va)) thanh ve cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu bach) or (tu sach)) ky tang ma hoi. hieu ve cam ((lo va) or (lao va)) thanh ve cua tre*.