Perhaps you should try some spelling variations:
hoang hai » hoang thi, hoang van
thu sach » tu sach, thuat sach, thuoc sach
te sach » toc sach
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
duc van » duc va, duc manh, duc phan
hai cua » thai cua, dai cua, hoi cua
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (te sach)) ky nang x hoi. hieu ve cham ((duc van) OR (duc tan)) hoang hai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (te sach)) ky nang x hoi. hieu ve cham ((duc van) OR (duc tan)) hoang hai cua te~".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (te sach)) ky nang x hoi. hieu ve cham ((duc van) OR (duc tan)) hoang hai cua te*.