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
hieu van » hieu va, thien van, lieu va
hieu ve » hieu va
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
vai cua » dai cua, hai cua, lai cua
sac ky » cac ky, sai ky
di cua » dai cua, doi cua, de cua
tu sac » tu sach, tu cac, tu san

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky lang xa hoi. ((hieu ve) OR (hieu van)) nam thuc dan hanh ((di cua) OR (vai cua)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky lang xa hoi. ((hieu ve) OR (hieu van)) nam thuc dan hanh ((di cua) or (vai cua)) triet~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky lang xa hoi. ((hieu ve) OR (hieu van)) nam thuc dan hanh ((di cua) or (vai cua)) triet*.