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
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
hieu va » lieu va, hieu qua
cao tuc » dao tuc, cao duc, cao suc
va hanh » va thanh, va danh, ban hanh
su tien » su kien, su hien, tu tieng
va cao » va cac, va co, va dao
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 ((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 ((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 ((va hanh) or (van hanh)) ki su tien*.