Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cam truc » cau truc, nam truc, lam truoc
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
van cam » van nam, van lam, van cau
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
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 y ((nang x) or (nang ma)) hoi. hieu van cam truc va danh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang x) OR (nang ma)) hoi. hieu van cam truc va danh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang x) or (nang ma)) hoi. hieu van cam truc va danh vi cuu tre*.