Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
su tien » su kien, su hien, tu tieng
nam tu » nam thu, nam thuc
va dan » ca dan, va dau, va dap
va dao » ca dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang x ho. hieu van nam tu ((va thanh) or (((va dan) OR (va dao)))) ky su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x ho. hieu van nam tu ((va thanh) OR (((va dan) OR (va dao)))) ky su tien*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang x ho. hieu van nam tu ((va thanh) or (((va dan) OR (va dao)))) ky su tien*".