Perhaps you should try some spelling variations:
thanh ve » hanh ve, thanh va, thanh vien
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
cac dat » cac dan, cai dat, cac dai
van cac » van hac, van cau, van bac
sach ty » sach tu, sach thu, xach tay
mai hoi » mai khoi, dai hoi, lai hoi
ve cua » le cua, de cua, te cua
ma hoi » xa hoi, ma hoa, me hoi

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)) nang ((ma hoi) or (mai hoi)). hieu van cac dat va thanh ve cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) nang ((ma hoi) OR (mai hoi)). hieu van cac dat va thanh ve cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach y)) nang ((ma hoi) or (mai hoi)). hieu van cac dat va thanh ve cua vat".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach y)) nang ((ma hoi) or (mai hoi)). hieu van cac dat va thanh ve cua vat*.