Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van chat » cao chat
chat duc » chat xuc, chat doc, chet duoc
te sach » toc sach
ty nang » ty xang, ty hang, ly nang
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
chau te » chau tho
co hoi » co hoc, co loi

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 ((ty nang) or (ky nang)) co hoi. hieu van chat duc ((va hanh) or (va danh)) lai chau te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty nang) OR (ky nang)) co hoi. hieu van chat duc ((va hanh) OR (va danh)) lai chau te.
• Adding a wildcard symbol may retrieve word variants: te sach ((ty nang) or (ky nang)) co hoi. hieu van chat duc ((va hanh) or (va danh)) lai chau te*.