Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dua tren » dung tren
hanh dai » hanh tai, hanh dao, vanh dai
thu sach » tu sach, thuat sach, thuoc sach
lang ha » long ha
sach ky » sac ky, sach y, sach ty
cam duc » cam xuc, cao duc, pham duc
va hanh » van hanh, va thanh, va danh
lang xa » dang xay, lang van
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky ((lang xa) or (lang ha)) hoi. hieu va cam duc va hanh dai ((dua tren) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((lang xa) OR (lang ha)) hoi. hieu va cam duc va hanh dai ((dua tren) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((lang xa) or (lang ha)) hoi. hieu va cam duc va hanh dai ((dua tren) or (cua triet))*.