Perhaps you should try some spelling variations:
khong thuoc » khang thuoc, hong phuoc, dong thuoc
nganh khong » nganh cong, nhanh chong, nganh nong
hoc nganh » hoc nhanh
cac thoi » cac toi, cac hop, cac tro
thoi gap » toi gap, thoi gian, thoi dai
thuoc xa » thuoc ma, thuoc va, thuoc la
nhan dan » phan dau, gian dan, nhan tai
cuu hoa » cuu khoa, cuu hoan, cau hoa
hoi van » hoi va, hoi dan, hai van
nhan va » nhan tai, nhan tao, phan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac thoi gap, nghien cuu hoa hoc nganh khong thuoc xa hoi van ((nhan va) OR (nhan dan))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac thoi gap, nghien cuu hoa hoc nganh khong thuoc xa hoi van ((nhan va) OR (nhan dan))".
• Adding a wildcard symbol may retrieve word variants: tu cac thoi gap, nghien cuu hoa hoc nganh khong thuoc xa hoi van ((nhan va) OR (nhan dan))*.