Perhaps you should try some spelling variations:
vien dai » hien dai
vien cac » vien bach, vien da, gian cac
va hanh » van hanh, va thanh, va danh
te sach » toc sach
cu lang » cua lang, tu lang, xu lang
tu sang » thu sang, tu san, tu lang
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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 ((tu sang) or (cu lang)) xa hoi. hieu ((vien cac) or (vien dai)) duc va hanh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tu sang) OR (cu lang)) xa hoi. hieu ((vien cac) OR (vien dai)) duc va hanh vi cua tu.
• Adding a wildcard symbol may retrieve word variants: te sach ((tu sang) or (cu lang)) xa hoi. hieu ((vien cac) or (vien dai)) duc va hanh vi cua tu*.