Perhaps you should try some spelling variations:
chat quoc » chuan quoc, thuat quoc, han quoc
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
ban benh » san benh, ba benh, ban banh
quoc ban » quoc bao, quoc lan, quoc quan
cua tre » cuu tre, cua triet, dua tren
benh vi » benh va, benh ve, benh li
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
lang ha » long ha
ha hoi » hoa hoi, ha noi, xa hoi
y lang » o lang, _ lang, tay lang
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) OR (hoc sach)) y lang ha hoi. hieu va chat quoc ban benh vi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) y lang ha hoi. hieu va chat quoc ban benh vi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) y lang ha hoi. hieu va chat quoc ban benh vi ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) y lang ha hoi. hieu va chat quoc ban benh vi ((cua tre) or (cua te))*.