Perhaps you should try some spelling variations:
dung tren » dung trong, dung trung
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » thu sach, su sach, tu cach
va hanh » van hanh, va thanh, va danh
cac duc » cac du, cao duc, cac dac
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
te sach » toc sach
ve cac » va cac, vien cac

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 (te sach)) ky lang xa hoi. hieu ve cac duc va hanh dai ((dung tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky lang xa hoi. hieu ve cac duc va hanh dai ((dung tren) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky lang xa hoi. hieu ve cac duc va hanh dai ((dung tren) or (cuu tre))*.