Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
pham duy » pham duc
van pham » san pham, van phan, van phat
ty nang » ky nang, ty hang, ly nang
duy van » duy vat, dung van
minh di » minh ai, minh duc, minh tri
minh de » menh de, minh ve, sinh de
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((ty nang) or (ty xang)) x ho. thien van pham duy van ((minh di) or (minh de)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ty nang) OR (ty xang)) x ho. thien van pham duy van ((minh di) OR (minh de)) cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ((ty nang) or (ty xang)) x ho. thien van pham duy van ((minh di) or (minh de)) cua tre*.