Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
thau xay » thuat xay, tu xay, phan xay
tang mai » tang ma, tang tai, lang mai
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
ky tang » ky nang, ky dang, kho tang
mai hoi » mai khoi, dai hoi, lai hoi
nam hoc » nam moc, am hoc, nam ho
nam hoi » nam khoa
xay ky » tay ky
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thau xay ky tang mai hoi. hieu van ((nam hoc) OR (nam hoi)) va thanh dai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thau xay ky tang mai hoi. hieu van ((nam hoc) OR (nam hoi)) va thanh dai cua te".
• Adding a wildcard symbol may retrieve word variants: thau xay ky tang mai hoi. hieu van ((nam hoc) OR (nam hoi)) va thanh dai cua te*.