Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
doi cua » dai cua, hoi cua
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
te sach » toc sach
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: ((su sach) or (te sach)) ky lang xa hoi. hieu va ((nhan luc) OR (nang luc)) va thanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (te sach)) ky lang xa hoi. hieu va ((nhan luc) OR (nang luc)) va thanh doi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (te sach)) ky lang xa hoi. hieu va ((nhan luc) OR (nang luc)) va thanh doi cua tre*".