Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nang doc » nang luc
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
vu cham » va cham, vu kham, tu cham
sach ty » sach y, sach tu, sach thu
ve chat » va chat, van chat
nang co » nang cao, nang noi, nang hoc
ca tren » cau tren, cu tren, la tren
xuc va » duc va, tuc va, luc va
va ca » va cac, va cao, va cai

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