Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nghien huu » nghien cuu, nguyen huu, nhiem huu
danh khoa » doanh khoa, anh khoa, danh hoa
sach hoc » cach hoc, sach hoi, mach hoc
hoc danh » hoc dan, hoc anh, hoc hanh
khoa hoc » hoa hoc
nhan tai » hang tai, toan tai
huu mot » cuu mot, huy mot, hieu mot
mot hoc » mon hoc, mo hoc, mot goc
van tai » von tai, van tuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach hoc tap, nghien huu mot hoc danh khoa hoc ma hoa co ((nhan tai) or (van tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach hoc tap, nghien huu mot hoc danh khoa hoc ma hoa co ((nhan tai) OR (van tai)).
• Adding a wildcard symbol may retrieve word variants: thuat sach hoc tap, nghien huu mot hoc danh khoa hoc ma hoa co ((nhan tai) or (van tai))*.