Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cam luoc » cam xuc, tom luoc, cam lo
luoc van » luoc can, luoc va, luc van
van hanh » van thanh, ban hanh, van anh
hieu ve » hieu va, hieu van
keo cua » kho cua, khoe cua, cheo cua
ve cam » ve cham, ve cac, va cam
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) ky nang x hoi. hieu ve cam luoc van hanh ((keo cua) OR (keo sua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky nang x hoi. hieu ve cam luoc van hanh ((keo cua) OR (keo sua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ky nang x hoi. hieu ve cam luoc van hanh ((keo cua) OR (keo sua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky nang x hoi. hieu ve cam luoc van hanh ((keo cua) OR (keo sua)) tre*.