Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
hanh tai » thanh tai, hang tai, han tai
hanh lai » hanh lam, thanh lap, thanh loi
tu sach » thu sach, su sach, te sach
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam

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 thu ((nang xa) OR (nang x)) hoi. hieu ve cam duc tan ((hanh lai) or (hanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu ((nang xa) OR (nang x)) hoi. hieu ve cam duc tan ((hanh lai) OR (hanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu ((nang xa) OR (nang x)) hoi. hieu ve cam duc tan ((hanh lai) or (hanh tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach thu ((nang xa) OR (nang x)) hoi. hieu ve cam duc tan ((hanh lai) or (hanh tai)) cua tre*.