Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
chua tre » chua tri, cua tre, chua trieu
vien dai » hien dai
lang mai » lang dai, lang hai, lang man
ca chua » ca cua, sua chua
hanh ca » hanh cac, hanh cat, hanh cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
te sach » toc sach
mai hoi » mai khoi, dai hoi, lai hoi
ky lang » ky nang, ky dang, ky tang
ve cac » va cac, vien cac

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 (thuat sach)) ky lang mai hoi. hieu ((ve cac) or (vien dai)) thuc va hanh ca chua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuat sach)) ky lang mai hoi. hieu ((ve cac) OR (vien dai)) thuc va hanh ca chua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thuat sach)) ky lang mai hoi. hieu ((ve cac) or (vien dai)) thuc va hanh ca chua tre*.