Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
lop tuan » do tuan, le tuan, hop toan
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cac lop » cac hop, cac loai
ve cac » va cac, vien cac
va cua » va chua, via cua, ma cua
ca cua » co cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang xa hoi. hieu ve cac lop tuan anh ((va cua) OR (ca cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. hieu ve cac lop tuan anh ((va cua) OR (ca cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu ve cac lop tuan anh ((va cua) OR (ca cua)) tre*.