Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh lai » hanh lam, hanh tai, thanh lap
dua tren » dung tren
dau tren » dau tien, dat tren, dau tieng
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty hang » ly hang, ty xang, thi hang
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
va hoi » xa hoi, va hoc, va hoa
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty hang va hoi. hieu va cam xuc va hanh lai ((((dua tren) or (cua triet))) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty hang va hoi. hieu va cam xuc va hanh lai ((((dua tren) OR (cua triet))) OR (dau tren)).
• Adding a wildcard symbol may retrieve word variants: so sach ty hang va hoi. hieu va cam xuc va hanh lai ((((dua tren) or (cua triet))) or (dau tren))*.