Perhaps you should try some spelling variations:
thong hoc » thuong hoc, tuong hoc, thong hoa
nganh hoa » thanh hoa, khanh hoa, danh hoa
mach hoc » cach hoc, dich hoc, anh hoc
tong hoc » tuong hoc, trong hoc, tong hop
gian dan » gian lang
tu mach » tu cach, tu manh, tu hach
va gian » va gianh, van gian, va giai
hoc xa » hoc ma

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 ((tong hoc) or (thong hoc)) nganh hoa hoc xa hoi va gian dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu mach hoc tap, nghien cuu ((tong hoc) OR (thong hoc)) nganh hoa hoc xa hoi va gian dan.
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cuu ((tong hoc) or (thong hoc)) nganh hoa hoc xa hoi va gian dan*.