Perhaps you should try some spelling variations:
cau triet » cau trieu, cua triet, va triet
thanh lap » thanh san, phan lap, thanh hai
su triet » su viet, su tien, ve triet
hanh lai » hanh lam, hanh tai, thanh loi
hieu van » hieu va, thien van, lieu va
van hac » van hoc, van ha, van hai
hac duc » hoc duc, ha duc, thach duc
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
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 ky nang xa hoi. hieu van hac duc va ((hanh lai) or (thanh lap)) ((cau triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu van hac duc va ((hanh lai) OR (thanh lap)) ((cau triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu van hac duc va ((hanh lai) or (thanh lap)) ((cau triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu van hac duc va ((hanh lai) or (thanh lap)) ((cau triet) OR (su triet))*.