Perhaps you should try some spelling variations:
phap lang » phap nang, phap tang, phap sang
thu bang » thu ban, thu hang, chu bang
te sach » toc sach
hieu va » lieu va, hieu qua
va dinh » van dinh, va kinh, va tinh
dinh di » dinh du, dinh vi, danh di
cuu tre » cua tre, cau tren, cau treo
cac tu » cac thu, cach tu, cac du
di cuu » di cau, di cua, dinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((phap lang) or (thu bang)) xa hoi. hieu va cac tu va dinh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((phap lang) OR (thu bang)) xa hoi. hieu va cac tu va dinh di cuu tre.
• Adding a wildcard symbol may retrieve word variants: te sach ((phap lang) or (thu bang)) xa hoi. hieu va cac tu va dinh di cuu tre*.