Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
thuc van » thuc vat, thuc dan, thuc va
su triet » su viet, su tien
van hanh » van thanh, ban hanh, van anh
ve triet » va trien
dang mau » dong mau, dang van, dang su
hieu va » lieu va, hieu qua
va nham » va cham, va tham, va nha
sach tu » sach thu, cach tu, sach ty
mau hoi » cau hoi, mai hoi, mau ho
hanh ki » hanh vi, hanh ky, hanh kien
tu dang » thu dang, tu dong, su dang
tu sach » thu sach, su sach, te sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach tu dang mau hoi. hieu va nham thuc van hanh ki ((su triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu dang mau hoi. hieu va nham thuc van hanh ki ((su triet) OR (ve triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach tu dang mau hoi. hieu va nham thuc van hanh ki ((su triet) or (ve triet))*.