Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
nam thuc » nam thuoc, am thuc, nam thu
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
tang ma » mang may, tang van
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
vi luu » vi lua
tru » truc

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 x) or (tang ma)) hoi. hieu va ((tham thuc) or (nam thuc)) va danh vi luu tru~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang x) OR (tang ma)) hoi. hieu va ((tham thuc) OR (nam thuc)) va danh vi luu tru.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang x) or (tang ma)) hoi. hieu va ((tham thuc) or (nam thuc)) va danh vi luu tru*.