Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
ty lang » tay lang, ty hang, tu lang
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
ve cac » va cac, vien cac
cua tu » cua tuc, cua su, cua cu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ((ty lang) or (ty xang)) xa hoi. hieu ve cac duc va hanh di ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ty lang) OR (ty xang)) xa hoi. hieu ve cac duc va hanh di ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: vu sach ((ty lang) or (ty xang)) xa hoi. hieu ve cac duc va hanh di ((cua te) or (cua tu))*.