Perhaps you should try some spelling variations:
hieu cua » hieu qua, dieu cua, bieu cua
cau treo » cau theo, cau tren, cau triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
cua lao » cu lao, ca lao, cua dao
lao luc » bao luc
hanh va » hanh vi
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky lang xa hoi. hieu cua lao luc va ((hanh va) or (hang va)) cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang xa hoi. hieu cua lao luc va ((hanh va) OR (hang va)) cau treo.
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang xa hoi. hieu cua lao luc va ((hanh va) or (hang va)) cau treo*.