Perhaps you should try some spelling variations:
nang chat » nang phat, nang cham, nang cao
chat hoc » chat hoa, chat thom, cho hoc
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
cao duc » dao duc, cao suc, giao duc
va hanh » va thanh, va danh, ban hanh
su tien » su kien, su hien, tu tieng
sach ly » sach y, sach lo, sach ty
cao tuc » dao tuc, cao suc, cao toc
hieu va » lieu va, hieu qua
ly nang » ky nang, ly hang, ly vang
ki su » ky su

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 ly nang chat hoc. hieu va ((cao tuc) OR (cao duc)) ((va hanh) or (van hanh)) ki su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly nang chat hoc. hieu va ((cao tuc) OR (cao duc)) ((va hanh) OR (van hanh)) ki su tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ly nang chat hoc. hieu va ((cao tuc) OR (cao duc)) ((va hanh) or (van hanh)) ki su tien".
• Adding a wildcard symbol may retrieve word variants: tu sach ly nang chat hoc. hieu va ((cao tuc) OR (cao duc)) ((va hanh) or (van hanh)) ki su tien*.