Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
nang hoa » nang hoat, hang hoa, nang hoc
vat phan » va phan, van phan, sat phan
phan lap » phan dau
su triet » su viet, su tien
ve triet » va trien
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hoa hoi » khoa hoi, hoa hoc, hoa doi
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang hoa hoi. hieu vu cham thuc vat phan lap ((su triet) OR (ve triet))~.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang hoa hoi. hieu vu cham thuc vat phan lap ((su triet) or (ve triet))*.