Perhaps you should try some spelling variations:
su triet » su viet, su tien
hieu van » hieu va, thien van, lieu va
ve triet » va trien
dan hai » doan hai, dang hai, dan khai
hoc tuc » hoc thuc, hoc truc, hoc tu
sach tu » sach thu, sach ty, sach uu
nang xa » nang x, lang xa, nang ma
cach tu » cach thuc
van hoc » van hoa
tuc va » thuc va, truc va, tuc xa
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach tu) OR (cach tu)) nang xa hoi. hieu van hoc tuc va dan hai ((ve triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tu) OR (cach tu)) nang xa hoi. hieu van hoc tuc va dan hai ((ve triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tu) OR (cach tu)) nang xa hoi. hieu van hoc tuc va dan hai ((ve triet) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach tu) OR (cach tu)) nang xa hoi. hieu van hoc tuc va dan hai ((ve triet) or (su triet))*.