Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
cong hoc » dong hoc, cong hoa, cong coc
cua nhan » ca nhan, cua ngan, cua nha
te sach » toc sach
dao tai » dao thai, dao tao, dao thi
cao tai » cao tang
pho hoa » pho ha, pho ho, cho hoa
hoc mai » hoc ma, hoc dai, hoc bai
mai hoi » mai khoi, dai hoi, lai hoi
hoi cua » hoi chuc
nhan va » nhan tai, nhan dan, nhan tao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((dao tai) or (cao tai)), nghien thu cong hoc pho hoa hoc mai hoi cua nhan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((dao tai) OR (cao tai)), nghien thu cong hoc pho hoa hoc mai hoi cua nhan va.
• Adding a wildcard symbol may retrieve word variants: te sach ((dao tai) or (cao tai)), nghien thu cong hoc pho hoa hoc mai hoi cua nhan va*.