Perhaps you should try some spelling variations:
hieu hieu » hien hieu, hieu hien, thien hieu
danh sai » dung sai, danh bat, danh dau
hieu cac » hieu luc, hieu va, hieu van
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
sai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
bo va » bao va, co va, mo va
so va » so van, so vat, su va
do va » do van

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 ky lang xa hoi. hieu hieu cac ((((bo va) or (so va))) or (do va)) danh sai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. hieu hieu cac ((((bo va) OR (so va))) OR (do va)) danh sai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. hieu hieu cac ((((bo va) or (so va))) or (do va)) danh sai cua tre*.