Perhaps you should try some spelling variations:
nganh khung » nganh khong, nhanh hung
nghien thu » nghiem thuc, nghiep thuc, nghe thu
hoc nganh » hoc nhanh
khung hoc » chung hoc, nhung hoc, thuong hoc
sach hoc » cach hoc, sach hoi, mach hoc
cong hoc » dong hoc, cong hoa, cong coc
dan chan » dan gian, dan ca, van chat
tu sach » thu sach, su sach, te sach
chan va » chuan va, nhan va, chat va
hoa » khoa

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 thu) or (nghien cuu)) cong hoc nganh khung hoc ma hoa dan chan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, ((nghien thu) OR (nghien cuu)) cong hoc nganh khung hoc ma hoa dan chan va.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, ((nghien thu) or (nghien cuu)) cong hoc nganh khung hoc ma hoa dan chan va*.