Perhaps you should try some spelling variations:
su sach » so sach, vu sach
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
va cam » va cham, va cac, va cao
di cua » dai cua, doi cua, de cua
cua tu » cua tuc, cua su, cua cu
ve cai » va cai, ve cac, ve tai
_ lang » o lang, _ land
v lang » va lang, o lang, van lang

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