Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
hang khoa » dung khoa
phan dang » phan dau, phan cong, nhan dan
thoi dai » hoc dai, hoi dap
hoc hang » hoc hanh, hoc bang, hoc tang
khoa hoc » hoa hoc
van phan » van phong, van thanh, luan phan
te cach » ve cach, te sach, tu cach
hoi dan » hoa dan, hoc dan, hoi dap
mot hoc » mon hoc, mo hoc, mot goc
hoi van » hoi va, hai van, hoi han
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: te cach ((thoi dai) or (hoi dan)), nghien cua mot hoc hang khoa hoc xa hoi van phan dang~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cach ((thoi dai) OR (hoi dan)), nghien cua mot hoc hang khoa hoc xa hoi van phan dang.
• Adding a wildcard symbol may retrieve word variants: te cach ((thoi dai) or (hoi dan)), nghien cua mot hoc hang khoa hoc xa hoi van phan dang*.