Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
thuc dan » thuc hanh, hoc dan, thuc vat
cam thuc » am thuc, nam thuc, cam thu
hieu ve » hieu van
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
hang di » hang doi, hang dien, hang dich
hang vi » hang va, hanh vi, khang voi
su sach » so sach, vu sach
y nang » ky nang, ly nang, v nang

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 y nang xa hoi. ((hieu ve) OR (hieu va)) cam thuc dan ((hang di) or (hang vi)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. ((hieu ve) OR (hieu va)) cam thuc dan ((hang di) OR (hang vi)) cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. ((hieu ve) OR (hieu va)) cam thuc dan ((hang di) or (hang vi)) cua viet*".