Perhaps you should try some spelling variations:
thanh tri » thanh tra, thanh tai, chinh tri
tu sach » thu sach, su sach, te sach
tri cuu » tri cua, tra cuu, trinh cuu
cam duc » cao duc, pham duc, nam duoc
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
lang xa » lang ha, dang xay, lang van
cuu tre » cua tre, cau tren, cau treo

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 ty ((tang ma) or (lang xa)) hoi. hieu va ((cam duc) OR (cam xuc)) gia thanh tri cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((tang ma) OR (lang xa)) hoi. hieu va ((cam duc) OR (cam xuc)) gia thanh tri cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((tang ma) or (lang xa)) hoi. hieu va ((cam duc) OR (cam xuc)) gia thanh tri cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((tang ma) or (lang xa)) hoi. hieu va ((cam duc) OR (cam xuc)) gia thanh tri cuu tre*.