Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
thuc day » thuc vat
thuc dan » thuc hanh, hoc dan, thuc vat
cau treo » cau theo, cau tren, cau triet
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
qua nam » quan nam, cua nam, quang nam
thuc va » thuc vat
dan tai » van tai, dan thi, han tai
tai cau » tai cac, tai cao

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 ky nang xa hoi. hieu qua nam ((((thuc va) or (thuc day))) or (thuc dan)) dan tai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky nang xa hoi. hieu qua nam ((((thuc va) OR (thuc day))) OR (thuc dan)) dan tai cau treo.
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang xa hoi. hieu qua nam ((((thuc va) or (thuc day))) or (thuc dan)) dan tai cau treo*.