Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
lang hai » lang chai, lang thai, lang ha
cham duc » pham duc, cham soc, pham duy
tinh lai » tinh lao, tinh hai, minh lai
dua tren » dung tren
sach ty » sach y, sach tu, sach thu
ty lang » tay lang, ty xang, ty hang
hai hoi » dai hoi, hai moi, hai hai
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty lang hai hoi. hieu ve cham duc va tinh lai ((dua tren) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty lang hai hoi. hieu ve cham duc va tinh lai ((dua tren) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: toc sach ty lang hai hoi. hieu ve cham duc va tinh lai ((dua tren) or (cua tre))*.