Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hoa lang » hoa dan, hoa van
vien cac » vien bach, vien dai, vien da
te sach » toc sach
tuc van » thuc van, truc van, tuc va
cua tuc » cua duc, cua tu, cua thuoc
o lang » hoi lang
vi cua » vai cua, di cua
ve cac » va cac

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 ((o lang) or (hoa lang)) xa hoi. hieu ((ve cac) OR (vien cac)) tuc van hanh vi cua tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((o lang) OR (hoa lang)) xa hoi. hieu ((ve cac) OR (vien cac)) tuc van hanh vi cua tuc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((o lang) or (hoa lang)) xa hoi. hieu ((ve cac) OR (vien cac)) tuc van hanh vi cua tuc".
• Adding a wildcard symbol may retrieve word variants: te sach ((o lang) or (hoa lang)) xa hoi. hieu ((ve cac) OR (vien cac)) tuc van hanh vi cua tuc*.