Perhaps you should try some spelling variations:
trinh viet » ninh viet, trinh vat
hieu van » hieu va, thien van, lieu va
viet cua » viec cua, viet ca, viet qua
va trinh » van trinh, va tinh, lap trinh
lam tuc » lam thuoc, lam truoc, luat tuc
van lam » van nam
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
nang xa » lang xa, mang xa, ang xa
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((((nang xa) OR (nang ma))) or (nang x)) hoi. hieu van lam tuc va trinh viet cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((((nang xa) OR (nang ma))) OR (nang x)) hoi. hieu van lam tuc va trinh viet cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((((nang xa) OR (nang ma))) or (nang x)) hoi. hieu van lam tuc va trinh viet cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((((nang xa) OR (nang ma))) or (nang x)) hoi. hieu van lam tuc va trinh viet cua tre*.