Perhaps you should try some spelling variations:
ve triet » va trien, su triet
hanh tao » hanh tai, hanh dao, hanh tam
tang van » dang van, hoang van, trong van
thuc va » thuc vat, thuc dan, thuc day
ve cham » va cham, ve chat, vu cham
sach ky » sach y, sach ty, sach kem
van hoe » van hoa, van hoc, van hieu
hieu ve » hieu va, hieu van
sac ky » cac ky, sai ky
tao ve » bao ve, tao va, tao he

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 ky) OR (sac ky)) tang van hoe. hieu ve cham ((tuc xa) or (thuc va)) hanh tao ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) tang van hoe. hieu ve cham ((tuc xa) OR (thuc va)) hanh tao ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sac ky)) tang van hoe. hieu ve cham ((tuc xa) or (thuc va)) hanh tao ve triet".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sac ky)) tang van hoe. hieu ve cham ((tuc xa) or (thuc va)) hanh tao ve triet*.