Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
cuu tre » cua tre, cau tren, cau treo
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
so sach » so sanh, bo sach, co sach
ve cac » va cac, vien cac
vi cuu » vi luu, vinh cuu
ve cam » ve cham, va cam, ve cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (so sach)) ky tang xa hoi. hieu ((ve cam) or (ve cac)) thuc va hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (so sach)) ky tang xa hoi. hieu ((ve cam) OR (ve cac)) thuc va hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (so sach)) ky tang xa hoi. hieu ((ve cam) or (ve cac)) thuc va hanh vi cuu tre*.