Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu viec » nhieu viec, hieu ve, sieu viet
hanh sai » hanh san, hanh tai, danh sai
viec dai » vien dai, viec tai, viec dat
nang xa » lang xa, nang ma, mang xa
vu sach » vu bach, vu khach
dai lao » dai lan, dai thao, dai luan
va hanh » van hanh, va thanh, va danh
sai cua » dai cua, hai cua, lai cua
su sach » so sach
lao va » tao va, cao va, bao va

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 ((nang xa) OR (nang x)) hoi. hieu viec dai lao va hanh sai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ky ((nang xa) OR (nang x)) hoi. hieu viec dai lao va hanh sai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ky ((nang xa) OR (nang x)) hoi. hieu viec dai lao va hanh sai cua triet*.