Perhaps you should try some spelling variations:
sach ty » sach tu, sach thu, xach tay
hoi cua » hoi chuc
vai cuu » vai cua
va dinh » van dinh, va kinh, va tinh
cao hoc » co hoc, cho hoc, chat hoc
hieu ve » hieu va, hieu van
xang ha » lang ha, tang ha, dang ha
ha hoi » hoa hoi, ha noi, xa hoi
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 hoi. hieu ve cao hoc va dinh ((vai cuu) or (hoi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) xang ha hoi. hieu ve cao hoc va dinh ((vai cuu) OR (hoi cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach y)) xang ha hoi. hieu ve cao hoc va dinh ((vai cuu) or (hoi cua)) tre*.