Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
cua triet » cua viet, su triet
thanh tai » thanh hai, thanh toan, doanh tai
va triet » va thiet, va trien, ve triet
qua cac » cua cac
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
bo va » bao va, so va, co va
do va » do van, so va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: nuoc sach ky nang ma hoi. hieu qua cac ((bo va) OR (do va)) thanh tai ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc sach ky nang ma hoi. hieu qua cac ((bo va) OR (do va)) thanh tai ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc sach ky nang ma hoi. hieu qua cac ((bo va) OR (do va)) thanh tai ((cua triet) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: nuoc sach ky nang ma hoi. hieu qua cac ((bo va) OR (do va)) thanh tai ((cua triet) or (va triet))*.