Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
lam ngoc » pham ngoc, lam nguoi, lang ngoc
su sach » so sach
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
van lam » van nam
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
vu sach » vu bach, vu khach
cua cu » cua chu, cua cau, cua su

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) or (vu sach)) ky dang xa hoi. hieu van lam ngoc ((va hanh) OR (va danh)) dai cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky dang xa hoi. hieu van lam ngoc ((va hanh) OR (va danh)) dai cua cu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) ky dang xa hoi. hieu van lam ngoc ((va hanh) OR (va danh)) dai cua cu".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky dang xa hoi. hieu van lam ngoc ((va hanh) OR (va danh)) dai cua cu*.