Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu viec » nhieu viec, hieu ve, sieu viet
viec cac » vien cac, viec cua, viec lam
sach lo » sach dao, sach doi, sach hoi
hang xa » hoang xa, hang va, hang ca
sach ly » sach y, sach ty, sach hay
thue va » thuc va, thuyet va, thuc vat
thu va » thuc va, tu va, thu ha
vi cua » vai cua, di cua

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