Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
sang ma » tang ma, sang tao, mang may
sach ty » sach y, sach tu, sach thu
van cau » van dau, van hau, van chat
nang ma » tang ma, nang cao, mang may
tu sach » thu sach, su sach, te sach
cau tu » dau tu, cau truc
vi ve » va ve, gi ve, vi he
ve ve » de ve, va ve, ke ve

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang ma) OR (sang ma)) hoi. hieu van cau tu va thanh ((vi ve) OR (ve ve)) triet~.
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang ma) or (sang ma)) hoi. hieu van cau tu va thanh ((vi ve) or (ve ve)) triet*.