Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dan tren » dat tren, dau tren, van tren
cho hoc » co hoc, khoa hoc
ve cham » va cham, ve chat, ve chim
sach ky » sac ky, sach y, sach ty
vu cham » va cham, vu kham, tu cham
cao hoc » co hoc, chat hoc
va hanh » van hanh, va thanh, va danh
hanh ke » hanh kem, thanh ke, hanh ky
xuc va » duc va, tuc va, luc va
ke dan » le dan

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 ((cao hoc) OR (cho hoc)). hieu ((ve cham) or (vu cham)) xuc va hanh ke dan tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((cao hoc) OR (cho hoc)). hieu ((ve cham) OR (vu cham)) xuc va hanh ke dan tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ((cao hoc) OR (cho hoc)). hieu ((ve cham) or (vu cham)) xuc va hanh ke dan tren*".