Perhaps you should try some spelling variations:
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
tu sach » thu sach, su sach, te sach
cuu tre » cua tre, cau tren, cau treo
lang xa » lang ha, dang xay, lang van
tang xa » trang xa, tang ma, tang ha
sach 6 » sach y, sach 2
ve cac » va cac, vien cac
vi cuu » vi luu, vinh cuu
va cai » va cac, va bai, va dai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach 6 ((tang xa) OR (lang xa)) hoi. hieu ((va cai) OR (ve cac)) thuc dan hanh vi cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach 6 ((tang xa) OR (lang xa)) hoi. hieu ((va cai) or (ve cac)) thuc dan hanh vi cuu tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach 6 ((tang xa) OR (lang xa)) hoi. hieu ((va cai) or (ve cac)) thuc dan hanh vi cuu tre*.