Perhaps you should try some spelling variations:
nang thuong » hang thuong, nang truong, dang thuong
thuong hoc » truong hoc, tuong hoc, thuong ho
cuu luong » cuu long, cu luong, cuu tuong
luong duc » duong duc, luong cuoc, luong dich
thanh van » thanh san, thanh toan, thanh phan
thanh hoa » thanh pho
mach hoc » cach hoc, dich hoc, anh hoc
duc nang » dun nang, cuc nang, duc bang
tu mach » tu cach, tu manh, tu hach
hai van » thai van, ha van, hai tan
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: tu mach hoc tap, nghien cuu luong duc nang thuong hoc ma hai van ((thanh van) or (thanh hoa))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu mach hoc tap, nghien cuu luong duc nang thuong hoc ma hai van ((thanh van) OR (thanh hoa)).
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cuu luong duc nang thuong hoc ma hai van ((thanh van) or (thanh hoa))*.