Perhaps you should try some spelling variations:
van nhan » van thanh, danh nhan, van khanh
van phan » van phong, van thanh, luan phan
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
hai cua » thai cua, dai cua, lai cua
hoi cua » hoi chuc
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang ma hoi. hieu ((van nhan) OR (van phan)) duc va hanh ((hai cua) or (hoi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ma hoi. hieu ((van nhan) OR (van phan)) duc va hanh ((hai cua) OR (hoi cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ma hoi. hieu ((van nhan) OR (van phan)) duc va hanh ((hai cua) or (hoi cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoi. hieu ((van nhan) OR (van phan)) duc va hanh ((hai cua) or (hoi cua)) tre*.