Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
thuc dan » thuc hanh, hoc dan, thuc vat
lang man » lang van, lang ban, lang mai
van cau » van dau, van hau, van chat
man hoi » man hoai, dan hoi, van hoi
sac ky » sai ky
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sac ky) OR (cac ky)) lang man hoi. hieu van cau ((tuc va) OR (thuc dan)) thanh vi cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) OR (cac ky)) lang man hoi. hieu van cau ((tuc va) OR (thuc dan)) thanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) OR (cac ky)) lang man hoi. hieu van cau ((tuc va) OR (thuc dan)) thanh vi cua viet*.