Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, pham thu
nham thuc » nhan thuc, nam thuc, nham thu
dan hanh » dang hanh, dan khanh, dan thanh
so sach » so sanh, bo sach, co sach
sach xu » sach xa, cach xu, mach xu
xu lang » cu lang, tu lang, xu dang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
hai cua » thai cua, hoi cua, lai cua

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