Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
suc nganh » luc nganh, chuc nganh, suc manh
khong hoc » khung hoc, thong hoc, khong thuoc
thanh van » thanh san, thanh toan, thanh phan
thanh hoa » thanh pho
sach hoc » cach hoc, sach hoi, mach hoc
cuu long » cuu cong, cuu tong, cuu nang
long suc » luong suc, cong suc, long cuc
thai van » thi van, thai vung, thai den
tu sach » thu sach, su sach, te sach
xa thai » ca thai, a thai, da thai
hoc xa » hoc ma

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 long suc nganh khong hoc xa thai van ((thanh van) or (thanh hoa))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cuu long suc nganh khong hoc xa thai van ((thanh van) OR (thanh hoa)).
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu long suc nganh khong hoc xa thai van ((thanh van) or (thanh hoa))*.