Perhaps you should try some spelling variations:
phap thuc » phap thu, phap hoc, phap tu
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
so sach » so sanh, bo sach, co sach
hai cua » thai cua, hoi cua, lai cua
hieu va » lieu va, hieu qua
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu van
lang xa » lang ha, dang xay, lang van
tu lang » cu lang, tu lanh, xu lang

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