Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
cach thoi » cac thoi, cach thuc, cach noi
thoi dap » hoi dap, thoi dai, thi dap
hoc phan » hoc dan
khoa hoc » hoa hoc
te cach » ve cach, te sach, tu cach
cua van » cua ban, cua vat, cua dan
nhan va » nhan tai, nhan dan, nhan tao
hoa ca » hoa cua, hoa cac, hoa cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: te cach thoi dap, nghien cua van ((hoc phan) or (hoc pho)) khoa hoc ma hoa ca nhan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cach thoi dap, nghien cua van ((hoc phan) OR (hoc pho)) khoa hoc ma hoa ca nhan va.
• Adding a wildcard symbol may retrieve word variants: te cach thoi dap, nghien cua van ((hoc phan) or (hoc pho)) khoa hoc ma hoa ca nhan va*.