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
mot hoc » mon hoc, mot goc, bot hoc
hai tan » hai van, hai quan
tan van » tran van, tang van, luan van
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 tan van tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat mach hoc tap, nghien cuu ((mot hoc) OR (mo hoc)) danh hoa hoc ma hai tan 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 tan van tai*.