Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
tu sach » thu sach, su sach, te sach
dvo van » dao van, do van
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
tang ma » tang van
ve cam » ve cham, ve cac, va cam
vi cua » vai cua, di cua
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: tu sach ky ((mang may) or (tang ma)) hoi. hieu ve cam ((vo van) or (dvo van)) thanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((mang may) OR (tang ma)) hoi. hieu ve cam ((vo van) OR (dvo van)) thanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((mang may) or (tang ma)) hoi. hieu ve cam ((vo van) or (dvo van)) thanh vi cua te*.