Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
dung doi » huong doi, dung tai, dung co
nang xa » nang x, lang xa, nang ma
cam duc » cam xuc, cao duc, pham duc
va dung » van dung, va duong, vat dung
doi cua » dai cua, hoi cua, dong cua
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: ((thu sach) OR (thuoc sach)) ky nang xa hoi. ((lieu va) or (hieu qua)) cam duc va dung doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) ky nang xa hoi. ((lieu va) OR (hieu qua)) cam duc va dung doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuoc sach)) ky nang xa hoi. ((lieu va) or (hieu qua)) cam duc va dung doi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuoc sach)) ky nang xa hoi. ((lieu va) or (hieu qua)) cam duc va dung doi cua tre*.