Perhaps you should try some spelling variations:
day thanh » dao thanh, dat thanh, da thanh
thanh va » thanh van, hanh va, thanh ha
thuc day » thuc dan, thuc vat
su sach » vu sach
chu tre » cho tre, chu tri, cuu tre
so sach » so sanh, bo sach, co sach
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
va chu » va che, va cau, va chi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (so sach)) ky nang x ho. hieu ((ve cam) or (ve cac)) thuc day thanh va chu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky nang x ho. hieu ((ve cam) OR (ve cac)) thuc day thanh va chu tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky nang x ho. hieu ((ve cam) or (ve cac)) thuc day thanh va chu tre*.