Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
vi su » va su, ve su, ki 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 ly ((nang xa) OR (lang xa)) hoi. hieu va cac ((duc va) or (truc va)) hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly ((nang xa) OR (lang xa)) hoi. hieu va cac ((duc va) OR (truc va)) hanh vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly ((nang xa) OR (lang xa)) hoi. hieu va cac ((duc va) or (truc va)) hanh vi su triet".
• Adding a wildcard symbol may retrieve word variants: su sach ly ((nang xa) OR (lang xa)) hoi. hieu va cac ((duc va) or (truc va)) hanh vi su triet*.