Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nang xa » lang xa, nang ma, mang xa
qua cac » cua cac
cac luc » cau luc, coc luc, cac nuoc
ca viet » va viet, co viet, hoa viet
luc va » duc va, tuc va, loc va
va dan » ca dan, va dao, va dau
dan va » doan va, dan ca, ban va
va ca » va cac, va cao, va cai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y ((nang xa) OR (nang x)) hoi. hieu qua cac luc va dan va ca viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y ((nang xa) OR (nang x)) hoi. hieu qua cac luc va dan va ca viet".
• Adding a wildcard symbol may retrieve word variants: thu sach y ((nang xa) OR (nang x)) hoi. hieu qua cac luc va dan va ca viet*.