Perhaps you should try some spelling variations:
thu sac » thu sach, thu san, thu xac
lai cua » dai cua, hai cua, lai chau
dan lai » dan loai, dan lap, dan lat
cac lop » cac hop, cac loai
cua tre » cua te, cuu tre, cua triet
thu ban » thu hang
va dan » ca dan, va dao, va dau
cac lo » cac co, cac bo, cac ho
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sac) or (thu ban)) ky nang x hoi. hieu qua ((cac lo) or (cac lop)) va dan lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sac) OR (thu ban)) ky nang x hoi. hieu qua ((cac lo) OR (cac lop)) va dan lai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thu sac) or (thu ban)) ky nang x hoi. hieu qua ((cac lo) or (cac lop)) va dan lai cua tre*.