Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nganh long » nganh cong, nganh nong, nganh khong
long thuoc » luong thuoc, dong thuoc, khong thuoc
goc nganh » hoc nganh, hoc nhanh, cac nganh
thuoc mai » thuoc ma, thuoc tai, thuoc moi
sach hoi » sach doi, sach moi, cach thoi
nhan dan » phan dau, nhan tai
gian dan » gian lang
hoi tap » hoi dap, hoc tap, hoi tai
cuu mot » cua mot, cuu mo, huu mot
mai hoi » mai khoi, dai hoi, lai hoi

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 hoi tap, nghien cuu mot goc nganh long thuoc mai hoi va ((nhan dan) or (gian dan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach hoi tap, nghien cuu mot goc nganh long thuoc mai hoi va ((nhan dan) OR (gian dan))*.