Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
va triet » va thiet, va trien, ve triet
dang xay » dang van, van xay
hanh vai » hanh vi, hanh va, hanh tai
viec cac » vien cac, viec cua, viec lam
va hanh » van hanh, va thanh, va danh
cac tac » cac toc, cac bac, cac dac
su sach » so sach
lang xa » lang ha, lang van
vu sach » vu bach, vu khach
tac va » tac da, tac xa, tuc va
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: ((su sach) or (vu sach)) ky ((lang xa) or (dang xay)) hoi. hieu viec cac tac va hanh vai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky ((lang xa) OR (dang xay)) hoi. hieu viec cac tac va hanh vai va triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky ((lang xa) or (dang xay)) hoi. hieu viec cac tac va hanh vai va triet*.