Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
trinh vi » trinh va, trinh ve, trinh viet
trang xa » trang va, trang ha, trong xa
su sach » so sach, vu sach
tinh vi » tinh voi, tinh va, dinh vi
cua tre » cua te, cuu tre, cua triet
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ve cac » va cac, vien cac

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 thu ((lang xa) or (trang xa)) hoi. hieu ve cac duc va ((tinh vi) or (trinh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu ((lang xa) OR (trang xa)) hoi. hieu ve cac duc va ((tinh vi) OR (trinh vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach thu ((lang xa) or (trang xa)) hoi. hieu ve cac duc va ((tinh vi) or (trinh vi)) cua tre*.