Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
su sach » so sach, vu sach
cam luc » cam xuc, cau luc
hanh ca » hanh cac, hanh cat, hanh cua
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach ty
hieu va » lieu va
nang ma » tang ma, sang ma, nang cao
luc va » duc va, tuc va, loc va
ma hoi » mai hoi, xa hoi, ma hoa
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang ma hoi. ((hieu va) OR (hieu qua)) cam luc va hanh ca ((cua triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ma hoi. ((hieu va) OR (hieu qua)) cam luc va hanh ca ((cua triet) OR (va thiet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ma hoi. ((hieu va) OR (hieu qua)) cam luc va hanh ca ((cua triet) or (va thiet))*".