Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
day hanh » day nhanh, day thanh, dao hanh
nam thuc » nam thuoc, nam thu, nam tu
hanh va » hang va, hanh vi
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh

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 ky dang xa hoi. hieu va ((nam thuc) or (am thuc)) day hanh va ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xa hoi. hieu va ((nam thuc) OR (am thuc)) day hanh va ((cua triet) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xa hoi. hieu va ((nam thuc) or (am thuc)) day hanh va ((cua triet) or (va triet))*.