Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
lang xa » lang ha, dang xay, lang van
tuc van » thuc van, truc van, tuc va
cua tuc » cua duc, cua tu, cua thuoc
sach o » sach lo, sac o, sach y
o lang » hoa lang, hoi lang
ve cac » va cac
vi cua » vai 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 o 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 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 xa hoi. hieu ((ve cac) OR (vien cac)) tuc van hanh vi cua tuc*.