Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach y, sach ty
nang co » nang cao, nang doc, nang noi
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
hanh va » hang va
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va

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 co hoc. hieu ve chat ((xuc va) or (luc va)) ((hanh va) OR (hanh vi)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang co hoc. hieu ve chat ((xuc va) OR (luc va)) ((hanh va) OR (hanh vi)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang co hoc. hieu ve chat ((xuc va) or (luc va)) ((hanh va) OR (hanh vi)) cau tren".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang co hoc. hieu ve chat ((xuc va) or (luc va)) ((hanh va) OR (hanh vi)) cau tren*.