Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
sach ly » sach lo, sach ty, sach hay
va hanh » van hanh, va thanh, va danh
cac tuc » cac toc, cac tu, cac tac
hieu ve » hieu va, hieu van
tai hai » thi hai, dai hai, tai ha
tai hoi » tai khoi, dai hoi, tai hoe
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa
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: tu ((sach ly) or (sach y)) hang ((tai hoi) OR (tai hai)). hieu ve cac tuc va hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ly) OR (sach y)) hang ((tai hoi) OR (tai hai)). hieu ve cac tuc va hanh vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ly) or (sach y)) hang ((tai hoi) OR (tai hai)). hieu ve cac tuc va hanh vi su triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ly) or (sach y)) hang ((tai hoi) OR (tai hai)). hieu ve cac tuc va hanh vi su triet*.