Perhaps you should try some spelling variations:
hoc thuc » hoc huu
danh lai » danh sai, gianh lai, dinh lam
sach thu » sach thue, sach thieu, sach tham
lai cua » dai cua, hai cua, lai chau
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
do thuc » dan thuc
sach uu » sach luu, sach tu, sach xu
x hoi » xa hoi, o hoi, x ho

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 uu) or (sach thu)) nang x hoi. hieu qua ((do thuc) OR (hoc thuc)) va danh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach uu) OR (sach thu)) nang x hoi. hieu qua ((do thuc) OR (hoc thuc)) va danh lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach uu) or (sach thu)) nang x hoi. hieu qua ((do thuc) OR (hoc thuc)) va danh lai cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach uu) or (sach thu)) nang x hoi. hieu qua ((do thuc) OR (hoc thuc)) va danh lai cua tre*.