Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van chat » cao chat
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
chat tu » nhat tu, chai tu, chay tu
va tinh » may tinh
va danh » va dinh, va dan, va hanh
su tien » su kien, su hien, tu tieng
ki su » ky su

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 chat tu ((va tinh) or (va danh)) ki su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x ho. hieu van chat tu ((va tinh) OR (va danh)) ki su tien.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x ho. hieu van chat tu ((va tinh) or (va danh)) ki su tien*.