Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
hai cua » thai cua, hoi cua, lai cua
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
hieu va » lieu va, hieu qua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky lang xa hoi. ((hieu ve) OR (hieu va)) nam thuc dan hanh ((hai cua) or (dai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. ((hieu ve) OR (hieu va)) nam thuc dan hanh ((hai cua) OR (dai cua)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang xa hoi. ((hieu ve) OR (hieu va)) nam thuc dan hanh ((hai cua) or (dai cua)) triet*".