Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
hac thuc » hoc thuc, ha thuc, thach thuc
thanh vi » hanh vi, thanh va, thanh ve
thuc gia » thuc giai, thue gia, thuc dia
hieu van » hieu va, thien van, lieu va
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
van hac » van hoc, van ha, van hai
sac ky » cac ky, sai ky

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 ty) or (sac ky)) nang xa hoi. hieu van hac thuc gia thanh vi ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ty) OR (sac ky)) nang xa hoi. hieu van hac thuc gia thanh vi ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach ty) or (sac ky)) nang xa hoi. hieu van hac thuc gia thanh vi ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: vu ((sach ty) or (sac ky)) nang xa hoi. hieu van hac thuc gia thanh vi ((cua triet) OR (va triet))*.