Perhaps you should try some spelling variations:
thanh lai » thanh hai, thanh lap, thanh loi
dua tren » dung tren
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
va tham » van tham, va cham, va thanh
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
ty tang » tay tang, ty xang, ty hang
loc va » hoc va, luc va
ma hoi » mai hoi, xa hoi, ma hoa
soc va » hoc va, doc va, goc va

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 ty tang ma hoi. hieu va tham ((soc va) or (loc va)) thanh lai ((dua tren) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty tang ma hoi. hieu va tham ((soc va) OR (loc va)) thanh lai ((dua tren) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty tang ma hoi. hieu va tham ((soc va) or (loc va)) thanh lai ((dua tren) or (cua tre))*.