Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
sach thu » sach thue, sach thieu, sach tham
van hanh » van thanh, ban hanh, van anh
cam duc » cam xuc, cao duc, pham duc
lai cua » dai cua, hai cua, lai chau
va hanh » va thanh, va danh, ban hanh
van cam » van nam, van lam, van cau
sach ty » sach y, sach tu, xach tay
sang xa » song xa, lang xa, sang ma
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 ty) or (sach thu)) sang xa hoi. hieu van cam duc ((va hanh) OR (van hanh)) lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach thu)) sang xa hoi. hieu van cam duc ((va hanh) OR (van hanh)) lai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (sach thu)) sang xa hoi. hieu van cam duc ((va hanh) OR (van hanh)) lai cua tre*".