Perhaps you should try some spelling variations:
phap thuc » phap thu, phap hoc, phap tu
hanh hai » thanh hai, nhanh hai, hang hai
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
so sach » so sanh, bo sach, hoc sach
hai cua » thai cua, dai cua, hoi cua
ve phap » va phap, de phap, ve phan
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
lang ha » long ha
lang xa » dang xay, lang van
co sach » bo sach, cuon sach, hoc sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (co sach)) tu ((lang xa) OR (lang ha)) hoi. hieu ve phap thuc dan hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) tu ((lang xa) OR (lang ha)) hoi. hieu ve phap thuc dan hanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (co sach)) tu ((lang xa) OR (lang ha)) hoi. hieu ve phap thuc dan hanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (co sach)) tu ((lang xa) OR (lang ha)) hoi. hieu ve phap thuc dan hanh hai cua tre*.