Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
nganh cong » nhanh chong, thanh cong
thuoc tai » nuoc tai, hoc tai, thuoc ma
hoa nganh » hoc nganh, khoi nganh, hoa doanh
tuoc tap » tuc tap, duoc tap, thuoc tan
cong hoa » dong hoa, dong hoc, hang hoa
cong hoc » dong hoc, cong coc, cong ho
van gian » van giang, dan gian, van giao
gian dan » gian lang
tu bach » vu bach, tu cach, tu bac
hoa van » hoa dan, hoang van, hoa phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu bach ((tuoc tap) or (thuoc tai)), nghien thu cong hoa nganh cong hoc ma hoa van gian dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bach ((tuoc tap) OR (thuoc tai)), nghien thu cong hoa nganh cong hoc ma hoa van gian dan.
• Adding a wildcard symbol may retrieve word variants: tu bach ((tuoc tap) or (thuoc tai)), nghien thu cong hoa nganh cong hoc ma hoa van gian dan*.