Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
ban thanh » ban hanh, ban hang
viec cac » vien cac, viec cua, viec lam
va triet » va thiet, va trien, ve triet
nang xa » lang xa, nang ma, mang xa
cac lop » cac hop, cac loai
su sai » su tai, su hai, su dai
sai ky » sac ky
vi va » vi van, vai va, vu 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 sai ky ((nang xa) OR (nang x)) hoi. hieu viec cac lop ((le thanh) or (ban thanh)) vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky ((nang xa) OR (nang x)) hoi. hieu viec cac lop ((le thanh) OR (ban thanh)) vi va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky ((nang xa) OR (nang x)) hoi. hieu viec cac lop ((le thanh) or (ban thanh)) vi va triet*".