Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
chat xu » chat xuc, chat huu, chat cua
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang x ho. hieu van ((chat xu) OR (chao xu)) ((va hanh) or (va danh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x ho. hieu van ((chat xu) OR (chao xu)) ((va hanh) OR (va danh)) dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x ho. hieu van ((chat xu) OR (chao xu)) ((va hanh) or (va danh)) dai cua tre*".