Perhaps you should try some spelling variations:
duy sang » duy van, duy can, duy anh
cac truc » cau truc, cac tru, cac trung
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
vi cua » vai cua, di cua
cua te » cua tu

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 ((duy sang) or (ky nang)) mai hoi. hieu ve cac truc van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((duy sang) OR (ky nang)) mai hoi. hieu ve cac truc van hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: te sach ((duy sang) or (ky nang)) mai hoi. hieu ve cac truc van hanh vi cua te*.