Perhaps you should try some spelling variations:
cao hoc » co hoc, cho hoc, chat hoc
hai cua » thai cua, dai cua, hoi cua
vai cuu » vai cua
va dinh » van dinh, va kinh, va tinh
sach ty » sach tu, sach thu, xach tay
hieu ve » hieu va, hieu van
xang ha » lang ha, tang ha, dang ha
ve cao » va cao, ve bao, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) or (sach y)) xang ha noi. hieu ve cao hoc va dinh ((vai cuu) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) xang ha noi. hieu ve cao hoc va dinh ((vai cuu) OR (hai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach y)) xang ha noi. hieu ve cao hoc va dinh ((vai cuu) or (hai cua)) tre*.