Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach bai » sach dao, cac bai, sach xa
bai nang » dai nang, bai tang, ban nang
nang mai » nang ma, nang tai, lang mai
danh vai » danh sai, danh va, doanh van
tu sach » thu sach, su sach, te sach
va danh » va dinh, va dan, va hanh
su tien » su kien, su hien, tu tieng
cao suc » cao su
cao duc » dao duc, giao duc, tao duoc
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi

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 bai nang mai hoi. hieu va ((cao duc) or (cao suc)) va danh vai ((cua triet) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach bai nang mai hoi. hieu va ((cao duc) OR (cao suc)) va danh vai ((cua triet) OR (su tien)).
• Adding a wildcard symbol may retrieve word variants: tu sach bai nang mai hoi. hieu va ((cao duc) or (cao suc)) va danh vai ((cua triet) or (su tien))*.