Perhaps you should try some spelling variations:
su triet » su tien, ve triet
hanh dai » hanh tai, hanh dao, vanh dai
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
su viet » so viet
lang xa » lang ha, dang xay, lang van
sach v » sach va, sach y, sach 2
ve cam » ve cham, va cam, ve cai
v lang » va lang, o lang, _ lang
ve cac » va cac, vien cac

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 v lang xa hoi. hieu ((ve cam) OR (ve cac)) truc va hanh dai ((su triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v lang xa hoi. hieu ((ve cam) OR (ve cac)) truc va hanh dai ((su triet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v lang xa hoi. hieu ((ve cam) OR (ve cac)) truc va hanh dai ((su triet) or (su viet))".
• Adding a wildcard symbol may retrieve word variants: su sach v lang xa hoi. hieu ((ve cam) OR (ve cac)) truc va hanh dai ((su triet) or (su viet))*.