Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
tru nang » tra nang, tri nang, truc nano
kha nang » phap nang, ky nang, ki nang
van cam » van nam, van lam, van cau
cam cua » ca cua, nam cua, cau cua
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, dua tren
tu sach » thu sach, su sach, te sach

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 ((tru nang) or (kha nang)) xa hoi. hieu van cam cua ban hanh di ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tru nang) OR (kha nang)) xa hoi. hieu van cam cua ban hanh di ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tru nang) or (kha nang)) xa hoi. hieu van cam cua ban hanh di ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tru nang) or (kha nang)) xa hoi. hieu van cam cua ban hanh di ((cua tre) OR (cua triet))*.