Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua dieu
sach ty » sach y, sach tu, sach thu
ty dang » ty xang, ky dang, ty hang
dang xa » dang xay, lang xa, dang ha
van cam » van nam, van cau, van dam
van lam » van nam
tuc van » thuc van, truc van, tuc va

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 ty dang xa hoi. hieu ((van cam) or (van lam)) tuc van hanh vi ((cua viet) OR (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty dang xa hoi. hieu ((van cam) OR (van lam)) tuc van hanh vi ((cua viet) OR (cua vat)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty dang xa hoi. hieu ((van cam) or (van lam)) tuc van hanh vi ((cua viet) OR (cua vat))".
• Adding a wildcard symbol may retrieve word variants: thu sach ty dang xa hoi. hieu ((van cam) or (van lam)) tuc van hanh vi ((cua viet) OR (cua vat))*.