Perhaps you should try some spelling variations:
sinh dao » minh dao, sinh dai, sinh lao
cuu cong » cua cong, thu cong, cac cong
cong cac » cuong cac, cong tac, cong cau
cac phan » cac nhan, cao phan, cap phan
phan hoa » phan loai, phan phoi, phan hong
dao tai » dao thai, dao tao, cao tai
hoc mai » hoc dai, hoc bai, hoc may
hoi cua » hoi chuc
cua dan » cua dang, cua ban, ca dan
dan dan » dang dan, ban dan, dao dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sinh dao tai, nghien cuu cong cac phan hoa ((hoc mai) or (hoc ma)) hoi cua dan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sinh dao tai, nghien cuu cong cac phan hoa ((hoc mai) OR (hoc ma)) hoi cua dan dan.
• Adding a wildcard symbol may retrieve word variants: hoc sinh dao tai, nghien cuu cong cac phan hoa ((hoc mai) or (hoc ma)) hoi cua dan dan*.