Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
van hanh » van thanh, ban hanh, van ban
viec cac » vien cac, viec cua, viec lam
va triet » va thiet, va trien, ve triet
lang ha » long ha
sach ky » sac ky, sach y, sach ty
lang xa » dang xay, lang van
cac tac » cac toc, cac bac, cac dac
van anh » van thanh, tuan anh, van minh
vu sach » vu bach, su sach, vu khach
vai va » mai va, dai va, hai va

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

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