Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
thau tay » thau xay, thai tay, thau tam
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
lai roi » lai hoi, loi roi
mai hoi » mai khoi, dai hoi, lai hoi
nam hoc » nam hoi, am hoc, nam ho
ky lang » ky nang, ky dang, ky tang
tai cua » thai cua, tai cuc, tri 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 roi)). hieu van ((nam hoc) or (nam moc)) va thanh tai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thau tay ky lang ((mai hoi) OR (lai roi)). hieu van ((nam hoc) OR (nam moc)) va thanh tai cua tu.
• Adding a wildcard symbol may retrieve word variants: thau tay ky lang ((mai hoi) or (lai roi)). hieu van ((nam hoc) or (nam moc)) va thanh tai cua tu*.