Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
doc sach » hoc sach, toc sach, nuoc sach
vat sinh » va sinh, van sinh, vi sinh
dua tren » dung tren
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va cham » va chat, va tham
cua te » cua tu

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 xa hoi. lieu va cham thuc vat sinh vien ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky nang xa hoi. lieu va cham thuc vat sinh vien ((dua tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: doc sach ky nang xa hoi. lieu va cham thuc vat sinh vien ((dua tren) or (cua te))*.