Perhaps you should try some spelling variations:
nang chat » nang phat, nang cham, nang cao
ban hanh » ban hang
cham tuc » nham thuc, pham thuc, tham thuc
chat hoc » chat hoa, chat thom, cho hoc
tu sach » thu sach, su sach, tu cach
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
ly nang » ky nang, ly hang, ly vang
te sach » toc sach
su tien » su kien, su hien, tu tieng
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) OR (te sach)) ly nang chat hoc. hieu va cham tuc ((va hanh) or (ban hanh)) ki su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ly nang chat hoc. hieu va cham tuc ((va hanh) OR (ban hanh)) ki su tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ly nang chat hoc. hieu va cham tuc ((va hanh) or (ban hanh)) ki su tien".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ly nang chat hoc. hieu va cham tuc ((va hanh) or (ban hanh)) ki su tien*.