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

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