Perhaps you should try some spelling variations:
thuat mach » thuat sach, thuat tach, thuyet mach
mach hoc » cach hoc, dich hoc, anh hoc
danh hoa » thanh hoa, khanh hoa, nganh hoa
hai luan » thai luan, khai luan, hai quan
mot hoc » mon hoc, mot goc, bot hoc
van tai » von tai, van tuan
mo hoc » mon hoc, co hoc
ma hai » ta hai, va hai, xa hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat mach hoc tap, nghien cuu ((mot hoc) or (mo hoc)) danh hoa hoc ma hai luan van tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat mach hoc tap, nghien cuu ((mot hoc) OR (mo hoc)) danh hoa hoc ma hai luan van tai.
• Adding a wildcard symbol may retrieve word variants: thuat mach hoc tap, nghien cuu ((mot hoc) or (mo hoc)) danh hoa hoc ma hai luan van tai*.