Perhaps you should try some spelling variations:
thuoc nganh » thuong nganh, hoc nganh, chuc nganh
cong thuoc » cong thuc, dong thuoc, long thuoc
nganh hoa » thanh hoa, khanh hoa, danh hoa
sach hoc » cach hoc, sach hoi, mach hoc
cuu cong » cua cong, thu cong, cac cong
hoa phan » hoa dan, co phan
phan van » thanh van, luan van, tran van
tu sach » thu sach, su sach, te sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach hoc tap, nghien cuu cong thuoc nganh hoa hoc ma hoa phan ((phan van) OR (pham van))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoc tap, nghien cuu cong thuoc nganh hoa hoc ma hoa phan ((phan van) OR (pham van))".
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu cong thuoc nganh hoa hoc ma hoa phan ((phan van) OR (pham van))*.