Perhaps you should try some spelling variations:
lang thai » lang chai, dang thai, lang hai
ve triet » va trien
su triet » su viet, su tien
cam thuc » am thuc, nam thuc, cam thu
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
thuc va » thuc vat, thuc dan, thuc day
va lang » va nang, hoa lang
ty nang » ky nang, ty xang, ty hang
tu sach » thu sach, su sach, te sach
va cam » va cham, va cac, va cao
x hoi » xa hoi, o hoi, 5 hoi

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 ty nang ((x hoi) OR (x ho)). hieu va cam thuc va lang thai ((su triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((x hoi) OR (x ho)). hieu va cam thuc va lang thai ((su triet) OR (ve triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((x hoi) OR (x ho)). hieu va cam thuc va lang thai ((su triet) or (ve triet))*".