Perhaps you should try some spelling variations:
lanh hai » manh hai, thanh hai, lang chai
danh hai » dang hai, manh hai, danh hau
sach tu » sach thu, sach ty, sach uu
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
cach tu » cach thuc
va cam » va cham, va cac, va cao
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach tu) or (cach tu)) nang x hoi. hieu va cam tuc xa ((danh hai) OR (lanh hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach tu) OR (cach tu)) nang x hoi. hieu va cam tuc xa ((danh hai) OR (lanh hai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach tu) or (cach tu)) nang x hoi. hieu va cam tuc xa ((danh hai) OR (lanh hai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach tu) or (cach tu)) nang x hoi. hieu va cam tuc xa ((danh hai) OR (lanh hai)) cua tre*.