Perhaps you should try some spelling variations:
cach thoi » cac thoi, cach thuc, cach noi
coc khoan » cac khoan, hoc khoa, con khoa
khoan hoa » khoan hoi, khoan nhoi, khoa hoc
gian lang » gian dan
thoi tap » toi tap, hoc tap, thoi dai
cuu cong » cua cong, thu cong
cac cong » cua cong
tu cach » tu cac
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 cach thoi tap, nghien ((cuu cong) or (cac cong)) coc khoan hoa hoc xa hoi va gian lang~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach thoi tap, nghien ((cuu cong) OR (cac cong)) coc khoan hoa hoc xa hoi va gian lang.
• Adding a wildcard symbol may retrieve word variants: tu cach thoi tap, nghien ((cuu cong) or (cac cong)) coc khoan hoa hoc xa hoi va gian lang*.