Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, lang xa, nang ma
hieu vu » hieu va, hieu su, dieu vu
hieu ve » hieu va, hieu van
soc van » hoc van, oc van, sac van
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (thu hoach)) ky nang xa hoi. ((hieu vu) or (hieu ve)) cham soc van hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thu hoach)) ky nang xa hoi. ((hieu vu) OR (hieu ve)) cham soc van hanh vi cua triet.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thu hoach)) ky nang xa hoi. ((hieu vu) or (hieu ve)) cham soc van hanh vi cua triet*.