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

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 vu ((cham xuc) OR (cham soc)) va tinh lai ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty lang hai hoi. hieu vu ((cham xuc) OR (cham soc)) va tinh lai ((dua tren) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty lang hai hoi. hieu vu ((cham xuc) OR (cham soc)) va tinh lai ((dua tren) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: toc sach ty lang hai hoi. hieu vu ((cham xuc) OR (cham soc)) va tinh lai ((dua tren) or (cuu tre))*.