Perhaps you should try some spelling variations:
pham trinh » pham tinh, pham minh, pham thanh
trinh van » trinh han, trinh quan, trinh toan
lap thuc » tap thuc, luan thuc, phap thuc
tu sach » thu sach, te sach, tu cach
van cua » vang cua, ban cua, dan cua
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
su sach » so sach, vu sach
va lap » va dap

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