Perhaps you should try some spelling variations:
mao triet » tao thiet, va triet, bo triet
sach tham » sach nha
tham nang » nham nang, tham lang, tham nhung
nang mai » nang ma, nang tai, lang mai
so thiet » soc thiet, hoc thiet, hoa thiet
hanh lam » thanh lap, hanh kem, hanh va
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
mai hoi » mai khoi, dai hoi, lai hoi
tuc va » thuc va, truc va, tuc xa
ve cai » va cai, ve tai, ve cau
ve cac » va cac, vien cac

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 tham nang mai hoi. hieu ((ve cai) or (ve cac)) tuc va hanh lam ((so thiet) or (mao triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tham nang mai hoi. hieu ((ve cai) OR (ve cac)) tuc va hanh lam ((so thiet) OR (mao triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach tham nang mai hoi. hieu ((ve cai) or (ve cac)) tuc va hanh lam ((so thiet) or (mao triet))*.