Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
thau tay » thau xay, thai tay, thau tam
hieu van » hieu va, thien van, hieu ve
va thanh » gia thanh, ban thanh, va tinh
lai hoi » dai hoi, lai hoa, lai roi
mai hoi » mai khoi, dai hoi, mai doi
nam hoc » nam moc, nam hoi, am hoc
ky lang » ky nang, ky dang, ky tang
hai cua » thai cua, dai cua, hoi cua
tay ky » tap ky, tan ky
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thau tay ky lang ((mai hoi) or (lai hoi)). ((hieu van) or (lieu va)) nam hoc va thanh hai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thau tay ky lang ((mai hoi) OR (lai hoi)). ((hieu van) OR (lieu va)) nam hoc va thanh hai cua tu.
• Adding a wildcard symbol may retrieve word variants: thau tay ky lang ((mai hoi) or (lai hoi)). ((hieu van) or (lieu va)) nam hoc va thanh hai cua tu*.