Perhaps you should try some spelling variations:
hoi nang » hoi lang, ho nang, hoa nang
qua cham » qua hai, qua cac, va cham
cham duc » pham duc, cham soc, pham duy
van hanh » van thanh, ban hanh, van anh
hanh hai » thanh hai, nhanh hai, hang hai
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
duc van » duc va, duc tan, duc manh
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet

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) OR (su sach)) hoi nang xa hoi. hieu qua cham duc van hanh hai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) hoi nang xa hoi. hieu qua cham duc van hanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) hoi nang xa hoi. hieu qua cham duc van hanh hai cua tre*.