Perhaps you should try some spelling variations:
trung van » truong van, trong van, trung va
cau trung » cau truong, cac trung, cao trung
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
van vanh » van anh, van hanh, van manh
vanh dai » van dai, vanh tai, lanh dao
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
van cau » van dau, van hau, van chat
cua tre » cua te, cuu tre, dua tren
sac ky » cac ky, sai ky

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) or (sac ky)) nang xa hoi. hieu van cau trung van vanh dai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang xa hoi. hieu van cau trung van vanh dai ((cua tre) OR (cua triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) nang xa hoi. hieu van cau trung van vanh dai ((cua tre) OR (cua triet))*".