Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
doc sach » hoc sach, toc sach, nuoc sach
han thai » han tai, van thai, than thoai
ban thai » ban than, ban thi, ban tai
nang xa » nang x, lang xa, nang ma
cac xuc » cam xuc, cac nuoc, chat xuc
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (doc sach)) ky nang xa hoi. lieu va cac xuc va ((han thai) OR (ban thai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (doc sach)) ky nang xa hoi. lieu va cac xuc va ((han thai) OR (ban thai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (doc sach)) ky nang xa hoi. lieu va cac xuc va ((han thai) OR (ban thai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (doc sach)) ky nang xa hoi. lieu va cac xuc va ((han thai) OR (ban thai)) cua tre*.