Perhaps you should try some spelling variations:
lang thai » lang chai, dang thai, lang hai
cam thuc » am thuc, nam thuc, cam thu
su triet » su viet, ve triet
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
tu lang » cu lang, tu lanh, xu lang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va lang » va nang, hoa lang
su tien » su kien, su hien, tu tieng
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: te sach tu lang xa hoi. hieu va cam thuc va lang thai ((su triet) OR (su tien))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu lang xa hoi. hieu va cam thuc va lang thai ((su triet) OR (su tien))".
• Adding a wildcard symbol may retrieve word variants: te sach tu lang xa hoi. hieu va cam thuc va lang thai ((su triet) OR (su tien))*.