Perhaps you should try some spelling variations:
chat doc » chat hoc, chau doc, thuat doc
te sach » toc sach
va danh » va dinh, va dan, dia danh
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, ban hanh
ve chat » va chat, van chat
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky tang ma hoa. hieu ve chat doc ((va hanh) or (va danh)) ((ly cua) or (le cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky tang ma hoa. hieu ve chat doc ((va hanh) OR (va danh)) ((ly cua) OR (le cua)) tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky tang ma hoa. hieu ve chat doc ((va hanh) or (va danh)) ((ly cua) or (le cua)) tre*.