Perhaps you should try some spelling variations:
thu mach » thu sach, thuat mach, thuc cach
pho hong » pho thong, pho uong, pho dong
hong duc » dang duc, ton duc
van luan » van quan, van tuan, von luan
hoa van » hoa dan, hoang van, hoa phan
mo hoc » mon hoc, co hoc
duc ma » duoc ma, duc mau, duc man

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu mach) OR (thu hoach)) hoc tap, nghien cuu mo hoc pho hong duc ma hoa van luan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu mach) OR (thu hoach)) hoc tap, nghien cuu mo hoc pho hong duc ma hoa van luan van".
• Adding a wildcard symbol may retrieve word variants: ((thu mach) OR (thu hoach)) hoc tap, nghien cuu mo hoc pho hong duc ma hoa van luan van*.