Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
sach ky » sach y, sach ty, sach kem
lai cuu » lai cua, lai chau, lai cuoc
va hanh » van hanh, va danh, ban hanh
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
sac ky » cac ky, sai ky
va cau » van cau, va cac, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (sac ky)) nang ma hoi. hieu va cau truc ((va hanh) OR (va thanh)) lai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang ma hoi. hieu va cau truc ((va hanh) OR (va thanh)) lai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) nang ma hoi. hieu va cau truc ((va hanh) OR (va thanh)) lai cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang ma hoi. hieu va cau truc ((va hanh) OR (va thanh)) lai cuu tre*.