Perhaps you should try some spelling variations:
gianh lai » gian lan
dieu hien » dieu khien, dieu kien, bieu hien
hieu hien » bieu hien, chieu chien, dieu khien
sach thu » sach thue, sach thieu, sach tham
va gianh » va gian, van giang, va giai
lai cua » dai cua, hai cua, lai chau
lang ha » long ha
ha hoi » hoa hoi, ha noi, xa hoi
cua te » cua tu
ky va » ly va, ke va, my va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach y) or (sach thu)) lang ha hoi. ((hieu hien) OR (dieu hien)) cac ky va gianh lai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach y) OR (sach thu)) lang ha hoi. ((hieu hien) OR (dieu hien)) cac ky va gianh lai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach y) or (sach thu)) lang ha hoi. ((hieu hien) OR (dieu hien)) cac ky va gianh lai cua te".
• Adding a wildcard symbol may retrieve word variants: su ((sach y) or (sach thu)) lang ha hoi. ((hieu hien) OR (dieu hien)) cac ky va gianh lai cua te*.