Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
dang xay » dang van, van xay
phan tri » phan thi, thanh tri, chan troi
xay hoi » xa hoi, tay hoi, cay phoi
cam duc » cam xuc, cao duc, nam duoc
va phan » van phan, va phat, va phap
cua tre » cua te, cuu tre, cua triet

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 thu) or (sach y)) dang xay hoi. lieu va ((cam duc) OR (pham duc)) va phan tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach thu) OR (sach y)) dang xay hoi. lieu va ((cam duc) OR (pham duc)) va phan tri cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach thu) or (sach y)) dang xay hoi. lieu va ((cam duc) OR (pham duc)) va phan tri cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach thu) or (sach y)) dang xay hoi. lieu va ((cam duc) OR (pham duc)) va phan tri cua tre*.