Perhaps you should try some spelling variations:
khong thuoc » hong phuoc, dong thuoc, khoa thuoc
khang thuoc » dang thuoc, hanh thuoc, khau thuoc
moi nganh » khoi nganh, hoc nganh, moi ngay
sach hoc » cach hoc, sach hoi, mach hoc
cuu cong » cua cong, thu cong, cac cong
cong moi » cong goi, cong mi, cong mot
mai khoa » tai khoa, may khoa, dai khoa
khoa cap » khoa cam, khoa tap, khoa can
cap nhan » ca nhan, cam nhan, cac nhan
nhan van » nhan dan, nhan va, phan 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 moi nganh ((khong thuoc) or (khang thuoc)) mai khoa cap nhan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cuu cong moi nganh ((khong thuoc) OR (khang thuoc)) mai khoa cap nhan van.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu cong moi nganh ((khong thuoc) or (khang thuoc)) mai khoa cap nhan van*.