Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
qua cau » quan cau, qua cac, qua ca
cau luc » cau truc, cau phuc
luc van » luoc van, luu van, duc van
vai cua » dai cua, hai cua, lai cua
y lang » o lang, tay lang, yen lang
_ lang » o lang, _ land
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: te sach ((y lang) OR (_ lang)) xa hoi. hieu qua cau luc van hanh ((vi cua) or (vai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y lang) OR (_ lang)) xa hoi. hieu qua cau luc van hanh ((vi cua) OR (vai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y lang) OR (_ lang)) xa hoi. hieu qua cau luc van hanh ((vi cua) or (vai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((y lang) OR (_ lang)) xa hoi. hieu qua cau luc van hanh ((vi cua) or (vai cua)) triet*.