Perhaps you should try some spelling variations:
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
cong xa » cong xay, cong xua, cong ha
hieu va » lieu va, hieu qua
sach ly » sach lo, sach ty, sach hay
di cua » dai cua, doi cua, de cua
va cam » va cham, va cac, va cao
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((sach ly) or (sach y)) cong xa hoi. hieu va cam xuc ((va hanh) or (va danh)) di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((sach ly) OR (sach y)) cong xa hoi. hieu va cam xuc ((va hanh) OR (va danh)) di cua te.
• Adding a wildcard symbol may retrieve word variants: doc ((sach ly) or (sach y)) cong xa hoi. hieu va cam xuc ((va hanh) or (va danh)) di cua te*.