Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
nganh khoa » nganh hoa, doanh khoa, anh khoa
cuu cong » cua cong, thu cong, cac cong
sach moi » sach doi, sach hoi, bach mai
bai khoi » bai choi, mai khoi, tai khoi
su sach » so sach, vu sach
va phan » van phan, va phat, va phap
khoi va » hoi va, khi va, choi va
phan va » phan van, nhan va, han va
hoc bai » hoc dai, hoc giai
cong co » dong co, cong cu, cong so
moi tap » moi tai, toi tap

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 moi tap, nghien cuu cong co ((nganh khoa) OR (nganh khong)) hoc bai khoi va phan va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach moi tap, nghien cuu cong co ((nganh khoa) OR (nganh khong)) hoc bai khoi va phan va".
• Adding a wildcard symbol may retrieve word variants: su sach moi tap, nghien cuu cong co ((nganh khoa) OR (nganh khong)) hoc bai khoi va phan va*.