Perhaps you should try some spelling variations:
danh kien » dinh kien, danh viet, linh kien
pham thuc » phap thuc, pham chuc, nham thuc
ninh viet » sinh vien
doc sach » hoc sach, toc sach, nuoc sach
sach ky » sac ky, sach y, sach ty
va pham » van pham, va phat, va phap
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach ky nang x hoi. lieu va pham thuc va ((danh kien) or (((ninh viet) OR (anh viet)))) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky nang x hoi. lieu va pham thuc va ((danh kien) OR (((ninh viet) OR (anh viet)))) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ky nang x hoi. lieu va pham thuc va ((danh kien) or (((ninh viet) OR (anh viet)))) cua tre".
• Adding a wildcard symbol may retrieve word variants: doc sach ky nang x hoi. lieu va pham thuc va ((danh kien) or (((ninh viet) OR (anh viet)))) cua tre*.