Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
duc van » duc va, duc tan, duc manh
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
sach tu » sach thu, cach tu, sach uu
lang xa » lang ha, dang xay, lang van
sach ty » sach y, sach thu, xach tay
cuu tre » cua tre, cau tren, cau treo

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