Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
nang tai » hang tai, tang tai, sang tai
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
va hanh » van hanh, va danh, ban hanh
dao cua » day cua, dan cua, do cua
sach ky » sac ky, sach y, sach ty
vi tham » vi pham, va tham, vi than
hieu vi » hieu voi, hieu va, hieu ve
tai hoi » tai khoi, dai hoi, tai hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang tai hoi. hieu vi tham thuc ((va hanh) OR (va thanh)) ((dao cua) or (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang tai hoi. hieu vi tham thuc ((va hanh) OR (va thanh)) ((dao cua) OR (dai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang tai hoi. hieu vi tham thuc ((va hanh) OR (va thanh)) ((dao cua) or (dai cua)) te".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang tai hoi. hieu vi tham thuc ((va hanh) OR (va thanh)) ((dao cua) or (dai cua)) te*.