Perhaps you should try some spelling variations:
manh hang » manh thang, manh hung, minh hang
cua triet » cua viet, su triet
hieu van » hieu va, thien van, lieu va
va triet » va thiet, va trien, ve triet
so sach » so sanh, bo sach, co sach
ty nang » ty xang, ty hang, ly nang
van cam » van nam, van lam, van cau
cam suc » cam xuc, cao suc, cham soc

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((ty nang) or (ky nang)) xa hoi. hieu van cam suc manh hang va ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ty nang) OR (ky nang)) xa hoi. hieu van cam suc manh hang va ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((ty nang) or (ky nang)) xa hoi. hieu van cam suc manh hang va ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: so sach ((ty nang) or (ky nang)) xa hoi. hieu van cam suc manh hang va ((cua triet) OR (va triet))*.