Perhaps you should try some spelling variations:
lam thuoc » nam thuoc, am thuc, cay thuoc
hieu van » hieu va, thien van, lieu va
lam truc » lam truoc, nam truc, lam trung
su sach » so sach, vu sach
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
sach ly » sach y, sach lo, sach ty
long ha » dong ha, cong ha, dong hoa
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 ly ((lang ha) or (long ha)) hoi. hieu van ((lam truc) OR (lam thuoc)) va danh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly ((lang ha) OR (long ha)) hoi. hieu van ((lam truc) OR (lam thuoc)) va danh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly ((lang ha) or (long ha)) hoi. hieu van ((lam truc) OR (lam thuoc)) va danh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach ly ((lang ha) or (long ha)) hoi. hieu van ((lam truc) OR (lam thuoc)) va danh vi cuu tre*.