Perhaps you should try some spelling variations:
trinh van » trinh han, trinh quan, trinh toan
va trinh » van trinh, va tinh, lap trinh
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
te sach » toc sach
van cuu » van cau, van chu, van cu
thuc va » thuc vat, thuc dan, thuc day
cuu tre » cua tre, cau tren, cau treo
nang xa » lang xa, nang ma, mang xa
su sach » so sach, vu sach

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (su sach)) ky ((nang xa) or (nang x)) hoi. hieu van nam thuc va trinh van cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (su sach)) ky ((nang xa) OR (nang x)) hoi. hieu van nam thuc va trinh van cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (su sach)) ky ((nang xa) or (nang x)) hoi. hieu van nam thuc va trinh van cuu tre*.