Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh lap » thanh san, phan lap, thanh hai
hieu van » hieu va, thien van, lieu va
hanh lai » hanh lam, hanh tai, thanh loi
tu sach » thu sach, su sach, te sach
van cac » van hac, van cau, van bac
ly nang » ly hang, ly vang, ly quang
cac dac » cac dan, cac dai, cac bac
dac va » duc va, day va, dat va

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 ((ly nang) OR (ky nang)) xa hoi. hieu van cac dac va ((hanh lai) or (thanh lap)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ly nang) OR (ky nang)) xa hoi. hieu van cac dac va ((hanh lai) OR (thanh lap)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ly nang) OR (ky nang)) xa hoi. hieu van cac dac va ((hanh lai) or (thanh lap)) cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ly nang) OR (ky nang)) xa hoi. hieu van cac dac va ((hanh lai) or (thanh lap)) cua triet*.