Perhaps you should try some spelling variations:
vu sach » su sach, vu khach
lang xa » lang ha, dang xay, lang van
qua cac » cua cac
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
y lang » o lang, _ lang, tay lang
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: ((vu sach) OR (vu bach)) y lang xa hoi. hieu qua cac duc va hanh ((vi cua) or (vai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu bach)) y lang xa hoi. hieu qua cac duc va hanh ((vi cua) OR (vai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (vu bach)) y lang xa hoi. hieu qua cac duc va hanh ((vi cua) or (vai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (vu bach)) y lang xa hoi. hieu qua cac duc va hanh ((vi cua) or (vai cua)) triet*.