Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
thuc dan » thuc hanh, hoc dan, thuc vat
dan sinh » dang sinh, doan sinh, van sinh
vien cua » viec cua, dien cua, tien cua
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va cham » va tham
va chat » van chat, va phat, cao chat
cua tre » cua te, cuu tre, cua triet

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. hieu ((va cham) OR (va chat)) thuc dan sinh vien cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ky nang xa hoi. hieu ((va cham) OR (va chat)) thuc dan sinh vien cua tre".
• Adding a wildcard symbol may retrieve word variants: doc sach ky nang xa hoi. hieu ((va cham) OR (va chat)) thuc dan sinh vien cua tre*.