Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
vat thanh » dat thanh, gat thanh, tat thanh
cam thuc » am thuc, nam thuc, cam thu
hieu van » hieu va, thien van, lieu va
hai cua » thai cua, dai cua, hoi cua
van cam » van nam, van lam, van cau
mai hoi » mai khoi, dai hoi, lai hoi
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach 2, sach vay
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: su ((sach v) or (sach y)) tang ((ma hoi) OR (mai hoi)). hieu van cam thuc vat thanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach v) OR (sach y)) tang ((ma hoi) OR (mai hoi)). hieu van cam thuc vat thanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach v) or (sach y)) tang ((ma hoi) OR (mai hoi)). hieu van cam thuc vat thanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach v) or (sach y)) tang ((ma hoi) OR (mai hoi)). hieu van cam thuc vat thanh hai cua tre*.