Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
ve triet » va trien, su triet
va triet » va thiet, va trien, cua triet
hanh vai » hanh vi, hanh va, hanh tai
viec cac » vien cac, viec cua, viec lam
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cac tuc » cac toc, cac tu, cac tac
va hanh » van hanh, va thanh, va danh
vu sach » vu bach, vu khach
su sach » so sach
tuc va » thuc va, truc va, tuc xa

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 lang xa hoi. hieu viec cac tuc va hanh vai ((va triet) OR (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky lang xa hoi. hieu viec cac tuc va hanh vai ((va triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) ky lang xa hoi. hieu viec cac tuc va hanh vai ((va triet) OR (ve triet))".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky lang xa hoi. hieu viec cac tuc va hanh vai ((va triet) OR (ve triet))*.