Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
mach hoc » cach hoc, dich hoc, anh hoc
hoa dang » khoa dang, hoa dan, hoa lang
thoi dai » hoc dai, hoi dap, hoi dan
dai nhat » dang nhat, moi nhat, dai han
nhat tan » nhat ban, nhat trang, nhat hanh
te mach » ke mach, te sach, tim mach
cua van » cua ban, cua vat, cua dan
xa thoi » xa hoi, xa khoi, xa thai

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

• Performing a fuzzy search may retrieve terms with similar spellings: te mach hoc tap, nghien cua van hoa dang ((khoa hoc) OR (hoa hoc)) xa thoi dai nhat tan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te mach hoc tap, nghien cua van hoa dang ((khoa hoc) OR (hoa hoc)) xa thoi dai nhat tan".
• Adding a wildcard symbol may retrieve word variants: te mach hoc tap, nghien cua van hoa dang ((khoa hoc) OR (hoa hoc)) xa thoi dai nhat tan*.