Perhaps you should try some spelling variations:
phap trinh » phap tinh, lap trinh, phap sinh
thuc phap » thuoc phap, thuc pham, thuc pha
trinh via » trinh va, trinh vi, trinh dia
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
van am » van nam, van lam, van dam

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

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