Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
lam truc » lam truoc, nam truc, lam thuoc
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
truc va » thuc va, thuc vat, trung va
hieu va » lieu va, hieu qua
su sach » so sach, vu sach
ly vang » ly hang, ly van, ly quang
ly lang » ly hang, le lang, ly lanh
cuu tre » cua tre, cau tren, cau treo
ha hoi » hoa hoi, ha noi, xa hoi
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) or (ly vang)) ha hoi. ((hieu van) OR (hieu va)) lam truc va danh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ly lang) OR (ly vang)) ha hoi. ((hieu van) OR (hieu va)) lam truc va danh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ly lang) or (ly vang)) ha hoi. ((hieu van) OR (hieu va)) lam truc va danh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ly lang) or (ly vang)) ha hoi. ((hieu van) OR (hieu va)) lam truc va danh vi cuu tre*.