Perhaps you should try some spelling variations:
lop tuan » do tuan, le tuan, hop toan
tu sach » thu sach, su sach, te sach
ky lang » ky dang, ky tang, tay lang
hieu ve » hieu va, hieu van
cac lop » cac hop, cac loai
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
anh va » hanh va
va cua » va chua, via cua, ca cua

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 lang) or (ky nang)) xa hoi. hieu ve cac lop tuan anh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky lang) OR (ky nang)) xa hoi. hieu ve cac lop tuan anh va cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) or (ky nang)) xa hoi. hieu ve cac lop tuan anh va cua tre*.