Perhaps you should try some spelling variations:
thieu lang » hieu lang, thieu khang, thieu quang
pham thuc » phap thuc, pham chuc, nham thuc
thu sach » tu sach, thuat sach, thuoc sach
thuc day » thuc dan, thuc vat
day dinh » dao dinh, day danh, dang dinh
dinh vai » dinh van, dinh vi, dinh va
cua tren » dua tren, ca tren, cua tre
lang xa » lang ha, dang xay, lang van
hieu ve » hieu van
hieu va » lieu va, hieu qua
vai cua » dai cua, hai cua, lai cua

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 thieu lang xa hoi. ((hieu ve) or (hieu va)) pham thuc day dinh vai cua tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach thieu lang xa hoi. ((hieu ve) OR (hieu va)) pham thuc day dinh vai cua tren.
• Adding a wildcard symbol may retrieve word variants: thu sach thieu lang xa hoi. ((hieu ve) or (hieu va)) pham thuc day dinh vai cua tren*.