Perhaps you should try some spelling variations:
hanh truc » hang truc, nhanh thuc, hanh thuoc
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
mang xa » lang xa, mang may, dang xay
truc va » thuc va, thuc vat, trung va
va hanh » va thanh, va danh, ban hanh
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 cao)) hoi. hieu van 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 cao)) hoi. hieu van hanh truc va hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((mang xa) or (nang cao)) hoi. hieu van hanh truc va hanh vi cuu tre*.