Perhaps you should try some spelling variations:
ve triet » va trien
lang hoa » hang hoa, lang ha, nang hoa
su triet » su viet, su tien
vat hanh » vat thanh, van hanh, va hanh
nam thuc » nam thuoc, am thuc, nam tu
hanh ve » hanh vi, hanh va, hanh kem
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky lang » ky nang, ky dang, ky tang

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