Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dua tren » dung tren
lang hai » lang chai, lang thai, lang ha
tinh lai » tinh lao, tinh hai, minh lai
sach tu » sach thu, cach tu, sach ty
cuu tre » cua tre, cau tren, cau treo
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
hai hoi » dai hoi, hai moi, hai hai
tu lang » cu lang, tu lanh, xu lang
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va

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 tu lang hai hoi. hieu ve cham ((xuc va) or (luc va)) tinh lai ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu lang hai hoi. hieu ve cham ((xuc va) OR (luc va)) tinh lai ((dua tren) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: toc sach tu lang hai hoi. hieu ve cham ((xuc va) or (luc va)) tinh lai ((dua tren) or (cuu tre))*.