Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
chua tre » chua tri, cua tre, chua trieu
va thanh » gia thanh, ban thanh, va tinh
sang mai » sang ma, sang tai, lang mai
va hanh » van hanh, va danh, ban hanh
cac tuc » cac toc, cac tu, cac tac
te sach » toc sach
mai hoi » mai khoi, dai hoi, lai hoi
ky sang » ky nang, ky dang, ky tang
hieu ve » hieu va, hieu van
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 sang mai hoi. hieu ve cac tuc ((va hanh) or (va thanh)) sua chua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuat sach)) ky sang mai hoi. hieu ve cac tuc ((va hanh) OR (va thanh)) sua chua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thuat sach)) ky sang mai hoi. hieu ve cac tuc ((va hanh) or (va thanh)) sua chua tre*.