Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
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, v nang
tuc va » thuc va, truc va, tuc xa
ma hoi » mai hoi, xa hoi, me hoi
ve cua » le cua, de cua, ve cum
te cua » tue cua, le cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang ((ma hoi) or (ma hoa)). hieu van cau tuc va tinh ((ve cua) or (te cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang ((ma hoi) OR (ma hoa)). hieu van cau tuc va tinh ((ve cua) OR (te cua)) tre.
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ((ma hoi) or (ma hoa)). hieu van cau tuc va tinh ((ve cua) or (te cua)) tre*.