Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hang hai » hoang hai, hang tai, thanh hai
hanh hai » thanh hai, nhanh hai, hanh tai
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
xuc va » duc va, tuc va, luc va
ve cam » ve cham, ve cac, va cam

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 ky nang ma hoa. hieu ve cam ((xuc va) or (truc va)) ((hanh hai) OR (hang hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang ma hoa. hieu ve cam ((xuc va) OR (truc va)) ((hanh hai) OR (hang hai)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang ma hoa. hieu ve cam ((xuc va) or (truc va)) ((hanh hai) OR (hang hai)) cua tre*".