Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
hoc nganh » hoc nhanh
khong hoc » khung hoc, thong hoc, khong thuoc
sach hoc » cach hoc, sach hoi, mach hoc
tan nhan » tran nhan, tao nhan, van nhan
su sach » so sach, vu sach
nhan va » nhan tai, nhan dan, nhan tao
mo hoc » mon hoc, co hoc
ma hai » va hai, xa hai, manh hai
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 hoc tap, nghien cuu mo hoc nganh khong hoc ((ma hai) OR (ta hai)) tan nhan va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach hoc tap, nghien cuu mo hoc nganh khong hoc ((ma hai) OR (ta hai)) tan nhan va".
• Adding a wildcard symbol may retrieve word variants: su sach hoc tap, nghien cuu mo hoc nganh khong hoc ((ma hai) OR (ta hai)) tan nhan va*.