Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
thai cua » than cua, tai cuc, tri cua
so sach » so sanh, bo sach, co sach
sach tu » sach thu, cach tu, sach ty
tu lang » cu lang, tu lanh, xu lang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
hai cua » hoi cua, lai cua, hai quan

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 pham thuc dan hanh ((((hai cua) OR (thai 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 pham thuc dan hanh ((((hai cua) OR (thai 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 pham thuc dan hanh ((((hai cua) OR (thai cua))) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: so sach tu lang xa hoi. hieu ve pham thuc dan hanh ((((hai cua) OR (thai cua))) or (dai cua)) tre*.