Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh lam » thanh lap, hanh kem, hanh va
sach thi » sach thu, sach tai, sach thieu
hieu van » hieu va, thien van, lieu va
va triet » va thiet, va trien, ve triet
thi hanh » thi thanh
mai hoi » mai khoi, dai hoi, lai hoi
cam duc » cam xuc, cao duc, nam duoc
va hanh » van hanh, va thanh, va danh
ma hoi » xa hoi, ma hoa, me hoi
lam va » nam va, dam va, lam ha

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 thi hanh ((ma hoi) OR (mai hoi)). hieu van ((cam duc) or (pham duc)) va hanh lam va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach thi hanh ((ma hoi) OR (mai hoi)). hieu van ((cam duc) OR (pham duc)) va hanh lam va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach thi hanh ((ma hoi) OR (mai hoi)). hieu van ((cam duc) or (pham duc)) va hanh lam va triet".
• Adding a wildcard symbol may retrieve word variants: thu sach thi hanh ((ma hoi) OR (mai hoi)). hieu van ((cam duc) or (pham duc)) va hanh lam va triet*.