Perhaps you should try some spelling variations:
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
dan vai » dan va, dan tai, dan vat
hai xuc » hai cuc, chat xuc, hai huoc
lang xa » dang xay, lang van
lang ha » long ha
cua tre » cua te, cuu tre, cua triet
hai xu » thai xu, hai vu, dai xu
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((lang xa) or (lang ha)) hoi. hieu qua ((hai xuc) OR (hai xu)) va dan vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((lang xa) OR (lang ha)) hoi. hieu qua ((hai xuc) OR (hai xu)) va dan vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((lang xa) or (lang ha)) hoi. hieu qua ((hai xuc) OR (hai xu)) va dan vai cua tre*".