Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
cham cuu » cap cuu, chat cua
sach ty » sach y, sach tu, xach tay
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
va cham » va chat, va tham
hieu va » lieu va, hieu qua
cuu tre » cau tren, cau treo
cuu va » cuu van, cuu ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ty) OR (sach thu)) nang x ho. hieu va cham cuu va hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach thu)) nang x ho. hieu va cham cuu va hanh vi ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) OR (sach thu)) nang x ho. hieu va cham cuu va hanh vi ((cua tre) or (cuu tre))*".