Perhaps you should try some spelling variations:
sach tham » sach nha
tham nang » nham nang, tham lang, tham nhung
bo triet » mao triet, mon triet, su triet
so thiet » soc thiet, hoc thiet, hoa thiet
xanh lam » hanh lam, dinh lam, xanh a
va xanh » va danh, va hanh, va anh
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
ve cai » va cai, ve tai, ve cau
ma hoi » mai hoi, xa hoi, ma hoa
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 ma hoi. hieu ((ve cai) or (ve cac)) thuc va xanh lam ((so thiet) or (bo triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tham nang ma hoi. hieu ((ve cai) OR (ve cac)) thuc va xanh lam ((so thiet) OR (bo triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach tham nang ma hoi. hieu ((ve cai) or (ve cac)) thuc va xanh lam ((so thiet) or (bo triet))*.