Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
hanh di » hanh vi, hanh de, hang di
xuc van » duc van, luc van, vuc van
lang xa » lang ha, dang xay, lang van
va lang » va nang, hoa lang
di cua » dai cua, doi cua, de 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) OR (toc sach)) va lang xa hoi. hieu ((va bai) or (va cac)) xuc van hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) va lang xa hoi. hieu ((va bai) OR (va cac)) xuc van hanh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) va lang xa hoi. hieu ((va bai) or (va cac)) xuc van hanh di cua te".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) va lang xa hoi. hieu ((va bai) or (va cac)) xuc van hanh di cua te*.