Perhaps you should try some spelling variations:
cham cuu » cap cuu, chat cua
dieu cua » dieu tra
toc sach » hoc sach, doc sach, thuoc sach
van han » van hanh, van phan, van nhan
va hang » van hang, va nang, va lang
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
cao hoi » cau hoi, co hoi, cao hoc
cua tre » cua te, cuu tre, cua triet

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 cao hoi. hieu ve cham cuu ((va hang) or (van han)) dieu cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky nang cao hoi. hieu ve cham cuu ((va hang) OR (van han)) dieu cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ky nang cao hoi. hieu ve cham cuu ((va hang) or (van han)) dieu cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ky nang cao hoi. hieu ve cham cuu ((va hang) or (van han)) dieu cua tre*.