Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh lai » thanh hai, thanh lap, thanh loi
thu sach » tu sach, thuoc sach, thu hoach
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
xuc va » tuc va, luc va, xac 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 (thuat sach)) ty nang xa hoi. hieu va cam ((xuc va) or (duc va)) thanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) ty nang xa hoi. hieu va cam ((xuc va) OR (duc va)) thanh lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuat sach)) ty nang xa hoi. hieu va cam ((xuc va) or (duc va)) thanh lai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuat sach)) ty nang xa hoi. hieu va cam ((xuc va) or (duc va)) thanh lai cua tre*.