Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
van hoc » van hoa
qua cac » cua cac
cac luc » cau luc, coc luc, cac nuoc
luc van » luoc van, luu van, duc van
y lang » tay lang, yen lang
_ lang » _ land
o lang » hoa lang, hoi lang
vi cua » vai cua, di cua
cua te » cua tu

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