Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
su sach » so sach
hai cua » thai cua, dai cua, hoi cua
duc van » duc va, duc tan, duc manh
duc ban » duc tan, dua ban, duc man
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
vu sach » vu bach, vu khach
ve cam » ve cham, ve cac, va cam

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 (vu sach)) ky nang xa hoi. hieu ve cam ((duc ban) or (duc van)) hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang xa hoi. hieu ve cam ((duc ban) OR (duc van)) hanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ky nang xa hoi. hieu ve cam ((duc ban) or (duc van)) hanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ky nang xa hoi. hieu ve cam ((duc ban) or (duc van)) hanh hai cua tre*.