Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
hieu voi » hieu moi, lieu voi, hieu loi
nang tai » hang tai, tang tai, sang tai
dao cua » day cua, dan cua, do cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu vi » hieu va, hieu ve, hien vi
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) or (hieu voi)) tham thuc va hanh ((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) OR (hieu voi)) tham thuc va hanh ((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) or (hieu voi)) tham thuc va hanh ((dao cua) OR (dai cua)) te".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang tai hoi. ((hieu vi) or (hieu voi)) tham thuc va hanh ((dao cua) OR (dai cua)) te*.