Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cao tuc » dao tuc, cao duc, cao toc
cao suc » cao su, cao duc
ca dan » cac dan, ca dao
ca cau » cua cau, cac cau, can cau

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 nang cau hoi. hieu va ((cao tuc) OR (cao suc)) ca dan ca cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang cau hoi. hieu va ((cao tuc) OR (cao suc)) ca dan ca cau tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang cau hoi. hieu va ((cao tuc) OR (cao suc)) ca dan ca cau tren*.