Perhaps you should try some spelling variations:
tan thanh » tran thanh, tang thanh, toan thanh
thanh di » thanh doi, thanh de, thanh do
thu sach » tu sach, thuat sach, thuoc sach
dang xay » dang van, van xay
te sach » toc sach
cam duc » cam xuc, cao duc, pham duc
hieu va » lieu va
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thu sach)) ky dang xay hoi. ((hieu va) or (hieu qua)) cam duc tan thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) ky dang xay hoi. ((hieu va) OR (hieu qua)) cam duc tan thanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) ky dang xay hoi. ((hieu va) or (hieu qua)) cam duc tan thanh di cua tre*.