Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
thu sach » tu sach, thuat sach, thuoc sach
va hanh » van hanh, va thanh, va danh
te sach » toc sach
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
va cao » va cac, va co, va dao
xuc va » duc va, tuc va, luc va
va cam » va cham, va cac, va cai
vi va » vi van, vai va, vu va

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 (thu sach)) ky lang xa hoi. hieu ((va cam) OR (va cao)) xuc va hanh vi va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) ky lang xa hoi. hieu ((va cam) OR (va cao)) xuc va hanh vi va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thu sach)) ky lang xa hoi. hieu ((va cam) OR (va cao)) xuc va hanh vi va trien".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) ky lang xa hoi. hieu ((va cam) OR (va cao)) xuc va hanh vi va trien*.