Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
cua tre » cua te, cuu tre, cua triet
hanh va » hang va, hanh vi
xa hanh » xa thanh, xa khanh, va hanh
nam tuc » nam thuc, nam truc, nam tu
hieu va » lieu va, hieu qua
tu sach » thu sach, te sach, tu cach
nang ma » tang ma, sang ma, nang cao
su sach » so sach, vu sach
ma hoi » mai hoi, xa hoi, ma hoa
va nam » van nam, ha nam, va nay

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 (su sach)) ky nang ma hoi. hieu va nam tuc xa hanh va ((cua tre) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang ma hoi. hieu va nam tuc xa hanh va ((cua tre) OR (va triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky nang ma hoi. hieu va nam tuc xa hanh va ((cua tre) or (va triet))*".