Perhaps you should try some spelling variations:
hanh truc » hang truc, nhanh thuc, hanh thuoc
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
mang xa » lang xa, mang may, dang xay
nang ma » sang ma, nang cao, mang may
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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 ((mang xa) or (((nang ma) OR (tang ma)))) hoi. hieu va hanh truc va hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((mang xa) OR (((nang ma) OR (tang ma)))) hoi. hieu va hanh truc va hanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((mang xa) or (((nang ma) OR (tang ma)))) hoi. hieu va hanh truc va hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((mang xa) or (((nang ma) OR (tang ma)))) hoi. hieu va hanh truc va hanh vi cuu tre*.