Perhaps you should try some spelling variations:
nganh duong » nganh cong, nhanh dong, anh duong
hoc nganh » hoc nhanh
duong hoc » dong hoc, dung hoc, duong hoi
van thanh » ban thanh, van tuan
sach hoi » sach doi, sach moi, cach thoi
van nhan » van phan, danh nhan, van khanh
su sach » so sach, vu sach
hoi tap » hoi dap, hoc tap, hoi tai
cuu mot » cua mot, cuu mo, huu mot
mot hoc » mon hoc, mo hoc, mot goc
hoc ta » hoc tap, hoc tai, hoc tan
ta hai » tai hai, tac hai, tra hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach hoi tap, nghien cuu mot hoc nganh duong hoc ta hai ((van nhan) or (van thanh)) van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach hoi tap, nghien cuu mot hoc nganh duong hoc ta hai ((van nhan) OR (van thanh)) van.
• Adding a wildcard symbol may retrieve word variants: su sach hoi tap, nghien cuu mot hoc nganh duong hoc ta hai ((van nhan) or (van thanh)) van*.