Perhaps you should try some spelling variations:
trinh vi » trinh va, trinh ve, trinh viet
va trinh » van trinh, va tinh, lap trinh
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach ty, sach kem
lam tuc » lam thuoc, lam truoc, luat tuc
van lam » van nam
nang xa » lang xa, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua

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