Perhaps you should try some spelling variations:
duy sang » duy van, duy can, duy anh
hieu van » hieu va, thien van, lieu va
te sach » toc sach
va hanh » van hanh, va thanh, va danh
lai cua » dai cua, hai cua, lai chau
vai cua » dai cua, hai cua, bai cua
van cam » van nam, van lam, van cau
cam tuc » cam xuc, cam tu, nam thuc
mai hoi » mai khoi, dai hoi, lai hoi
tuc va » thuc va, truc va, tuc xa

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