Perhaps you should try some spelling variations:
hoc thanh » hoc nhanh, hoan thanh, hoc phan
cong coc » cong cuoc, cong cac, cong co
van nhan » van phan, van thanh, danh nhan
nhan van » nhan dan, nhan va, phan van
tu sach » thu sach, su sach, te sach
hoi tap » hoi dap, hoc tap, hoi tai
hoc tai » hoc dai, hoc tap, hoc bai
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
hai van » thai van, ha van, hai tan
coc ta » toc ta, co ta, coc ha
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: tu sach ((hoi tap) or (hoc tai)), nghien cuu mon hoc thanh cong coc ta hai van nhan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((hoi tap) OR (hoc tai)), nghien cuu mon hoc thanh cong coc ta hai van nhan van.
• Adding a wildcard symbol may retrieve word variants: tu sach ((hoi tap) or (hoc tai)), nghien cuu mon hoc thanh cong coc ta hai van nhan van*.