Perhaps you should try some spelling variations:
nganh hoa » thanh hoa, danh hoa, ninh hoa
khanh hoa » thanh hoa, hang hoa
toc mach » toc sach, hoc mac, tim mach
mach hoc » cach hoc, dich hoc, anh hoc
cuu long » cuu cong, cuu tong, cuu nang
dap nhan » dap nha, dac nhan, dam nhan
nhan dan » phan dau, gian dan, nhan tai
long co » dong co, cong co, lang co
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: toc mach hoc tap, nghien cuu long co ((nganh hoa) or (khanh hoa)) hoc xa hoi dap nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc mach hoc tap, nghien cuu long co ((nganh hoa) OR (khanh hoa)) hoc xa hoi dap nhan dan.
• Adding a wildcard symbol may retrieve word variants: toc mach hoc tap, nghien cuu long co ((nganh hoa) or (khanh hoa)) hoc xa hoi dap nhan dan*.