Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
cac thuc » cach thuc, cac thu, can thuc
toc sach » hoc sach, doc sach, thuoc sach
so sanh » do sanh
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va hang » van hang, va nang, va lang
hang di » hang doi, hang vi, hang dien
ve cac » va cac, vien cac
di cau » da cau, diem cau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((((te sach) or (toc sach))) or (so sanh)) ky nang xa hoi. hieu ve cac thuc va hang di cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((te sach) OR (toc sach))) OR (so sanh)) ky nang xa hoi. hieu ve cac thuc va hang di cau tren.
• Adding a wildcard symbol may retrieve word variants: ((((te sach) or (toc sach))) or (so sanh)) ky nang xa hoi. hieu ve cac thuc va hang di cau tren*.