Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hanh ki » hanh vi, hanh ky, hanh kien
sach ky » sac ky, sach ty, sach kem
lang xa » lang ha, dang xay, lang van
va cao » va cac, va co, va dao
tuc va » thuc va, truc va, tuc xa
luc va » duc va, loc va
ki su » ky su

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 (sach y)) lang xa hoi. lieu va cao ((tuc va) or (luc va)) hanh ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) lang xa hoi. lieu va cao ((tuc va) OR (luc va)) hanh ki su triet.
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach y)) lang xa hoi. lieu va cao ((tuc va) or (luc va)) hanh ki su triet*.