Perhaps you should try some spelling variations:
tan thanh » tran thanh, tang thanh, toan thanh
thanh van » thanh san, thanh toan, thanh phan
te sach » toc sach
sach ly » sach y, sach lo, sach ty
ly hang » ly quang
hieu vu » hieu ve, hieu su, dieu vu
hieu va » lieu va, hieu qua
van cua » vang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet

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 ly hang ((xa hoi) OR (ma hoa)). ((hieu vu) OR (hieu va)) pham duc tan thanh van cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ly hang ((xa hoi) or (ma hoa)). ((hieu vu) OR (hieu va)) pham duc tan thanh van cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ly hang ((xa hoi) or (ma hoa)). ((hieu vu) OR (hieu va)) pham duc tan thanh van cua tre*.