Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu quan » hieu qua, lieu quan, thien quan
thu sach » tu sach, thuoc sach, thu hoach
cau thuc » cau truc, cuu thuc, can thuc
quan cau » quang cao, toan cau, quan ha
nang xa » nang x, lang xa, nang ma
te sach » toc sach
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((thu sach) or (thuat sach))) or (te sach)) ky nang xa hoi. hieu quan cau thuc va danh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((thu sach) OR (thuat sach))) OR (te sach)) ky nang xa hoi. hieu quan cau thuc va danh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((((thu sach) or (thuat sach))) or (te sach)) ky nang xa hoi. hieu quan cau thuc va danh vi cua tre*.