Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
nam thuc » nam thuoc, am thuc, nam tu
lang hoa » hang hoa, lang ha, nang hoa
vat hanh » vat thanh, van hanh, nhat hanh
va hanh » van hanh, va thanh, va danh
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
ve su » va su

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) OR (va hanh)) ve su 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) OR (va hanh)) ve su 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) OR (va hanh)) ve su triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang hoa hoi. hieu ve ((nam thuc) or (nam thu)) ((vat hanh) OR (va hanh)) ve su triet*.