Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
duc van » duc va, duc tan, duc manh
cam duc » cam xuc, cao duc, pham duc
hieu va » lieu va, hieu qua
hang xa » hoang xa, hang va, hang ca
ty hang » ly hang, ty xang, thi hang
so sanh » do sanh
va cam » va cham, va cac, va cao
vi cua » di cua

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) or (so sanh)) ty hang xa hoi. hieu va cam duc van hanh ((vi cua) or (vai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sanh)) ty hang xa hoi. hieu va cam duc van hanh ((vi cua) OR (vai cua)) te.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) ty hang xa hoi. hieu va cam duc van hanh ((vi cua) or (vai cua)) te*.