Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, hieu ve
thanh de » hanh de, thanh ve, thanh do
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hoc duc » hoc duoc, hoc nuoc, hoc thuc
duc van » duc va, duc tan, duc manh
ma hoi » mai hoi, ma hoa, me hoi
de cua » le cua, te cua, dieu cua
cua tu » cua tuc, cua su, cua cu

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: te sach ky nang ((ma hoi) OR (xa hoi)). ((hieu van) OR (lieu va)) hoc duc van thanh de cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((ma hoi) or (xa hoi)). ((hieu van) OR (lieu va)) hoc duc van thanh de cua tu~".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((ma hoi) or (xa hoi)). ((hieu van) OR (lieu va)) hoc duc van thanh de cua tu*.