Perhaps you should try some spelling variations:
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac nuoc
cac dac » cac dan, cac dai, cac bac
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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 (su sach)) ky nang x ho. hieu va ((cac duc) or (cac dac)) va danh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang x ho. hieu va ((cac duc) OR (cac dac)) va danh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang x ho. hieu va ((cac duc) or (cac dac)) va danh vi cuu tre*.