Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
doi quy » dot quy, doi duy, noi quy
doi qua » doi cua, hoi qua, doi xua
va tinh » may tinh
cau tuc » cau truc, cau tu, cau luc
van cau » van dau, van hau, van chat
y nang » ky nang, ly nang, may nang
tuc va » thuc va, truc va, tuc xa
v nang » va nang, vu nang, van nang
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((y nang) OR (v nang)) x hoi. hieu van cau tuc va tinh ((doi qua) or (doi quy)) su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((y nang) OR (v nang)) x hoi. hieu van cau tuc va tinh ((doi qua) OR (doi quy)) su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((y nang) OR (v nang)) x hoi. hieu van cau tuc va tinh ((doi qua) or (doi quy)) su".
• Adding a wildcard symbol may retrieve word variants: so sach ((y nang) OR (v nang)) x hoi. hieu van cau tuc va tinh ((doi qua) or (doi quy)) su*.