Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
chat xuc » chat huu, cam xuc, chao xu
thi nang » ki nang, thi hanh
dieu cua » dieu tra
thi cong » tai cong, thien cong
van anh » van thanh, tuan anh
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
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: toc sach ((thi nang) or (thi cong)) xa hoi. hieu va chat xuc ((van anh) OR (van minh)) dieu cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((thi nang) OR (thi cong)) xa hoi. hieu va chat xuc ((van anh) OR (van minh)) dieu cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((thi nang) or (thi cong)) xa hoi. hieu va chat xuc ((van anh) OR (van minh)) dieu cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ((thi nang) or (thi cong)) xa hoi. hieu va chat xuc ((van anh) OR (van minh)) dieu cua tre*.