Perhaps you should try some spelling variations:
hanh thuoc » thanh phuoc, hanh phuc, dang thuoc
hanh truc » hang truc, nhanh thuc, hanh phuc
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
mang xa » lang xa, mang may, dang xay
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) OR (hanh thuoc)) 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) OR (hanh thuoc)) 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 cao)) hoi. hieu van ((hanh truc) OR (hanh thuoc)) 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) OR (hanh thuoc)) va hanh vi cuu tre*.