Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
dan thuc » dan toc, am thuc
xach tay » canh tay
hanh lai » hanh lam, hanh tai, thanh lap
hieu van » hieu va, thien van, lieu va
dau thuc » dai thuc, dam thuc, day thuc
lai cua » dai cua, hai cua, lai chau
va hanh » van hanh, va thanh, va danh
nang xa » nang x, lang xa, nang ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach y) or (xach tay)) nang xa hoi. hieu van ((dau thuc) OR (dan thuc)) va hanh lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach y) OR (xach tay)) nang xa hoi. hieu van ((dau thuc) OR (dan thuc)) va hanh lai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach y) or (xach tay)) nang xa hoi. hieu van ((dau thuc) OR (dan thuc)) va hanh lai cua viet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach y) or (xach tay)) nang xa hoi. hieu van ((dau thuc) OR (dan thuc)) va hanh lai cua viet*.