Perhaps you should try some spelling variations:
chuan quoc » han quoc, cua quoc, phan quoc
hieu van » thien van, lieu va, hieu ve
danh vai » danh sai, danh va, doanh van
lang van » dang van, tang van, hoang van
hieu va » lieu va, hieu qua
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
quoc va » nuoc va, duoc va, quoc gia
tu sach » thu sach, su sach, te sach
sach lo » sach dao, sach doi, sach hoi
lang xa » lang ha, dang xay
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: tu sach lo ((lang xa) OR (lang van)) hoi. ((hieu van) or (hieu va)) chuan quoc va danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach lo ((lang xa) OR (lang van)) hoi. ((hieu van) OR (hieu va)) chuan quoc va danh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach lo ((lang xa) OR (lang van)) hoi. ((hieu van) or (hieu va)) chuan quoc va danh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach lo ((lang xa) OR (lang van)) hoi. ((hieu van) or (hieu va)) chuan quoc va danh vai cua tre*.