Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
lai cua » dai cua, hai cua, lai chau
vai cua » dai cua, hai cua, bai cua
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hoa doi » hoa dai, hoc doi, xoa doi
hoa hoi » khoa hoi, hoa hoc, hoc hoi
ky lang » ky nang, ky dang, ky tang
hieu ly » hieu ky, lieu ly, dieu ly
ly am » ly nam, ly lam, ly tam

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 ky lang ((hoa hoi) OR (hoa doi)). hieu ly am thuc van hanh ((vai cua) or (lai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang ((hoa hoi) OR (hoa doi)). hieu ly am thuc van hanh ((vai cua) OR (lai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang ((hoa hoi) OR (hoa doi)). hieu ly am thuc van hanh ((vai cua) or (lai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang ((hoa hoi) OR (hoa doi)). hieu ly am thuc van hanh ((vai cua) or (lai cua)) triet*.