Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
vien cua » viec cua, dien cua, tien cua
toc sach » doc sach, thuoc sach, nuoc sach
dan sinh » dang sinh, doan sinh, van sinh
thuc dan » thuc hanh, hoc dan, thuc vat
va chat » van chat, va phat, cao chat
va cham » va tham
nang xa » nang x, lang xa, nang ma
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: ((hoc sach) or (toc sach)) ky nang xa hoi. hieu ((va cham) or (va chat)) thuc dan sinh vien cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (toc 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: ((hoc sach) or (toc sach)) ky nang xa hoi. hieu ((va cham) or (va chat)) thuc dan sinh vien cua tre*.