Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
thuc dan » thuc hanh, hoc dan, thuc vat
dan sinh » dang sinh, doan sinh, van sinh
doc sac » doc sach, dac sac, hoc sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va cham » va chat, va tham
cua tre » cuu tre, cua triet, dua tren
sac ky » cac ky, sai ky
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 sac ky nang xa hoi. hieu va cham thuc dan sinh vien ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sac ky nang xa hoi. hieu va cham thuc dan sinh vien ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: doc sac ky nang xa hoi. hieu va cham thuc dan sinh vien ((cua tre) or (cua te))*.