Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
sach ty » sach tu, sach thu, xach tay
lang xa » lang ha, dang xay, lang van
van cam » van nam, van lam, van cau
tinh va » tich va, trinh van, trinh vat
ca viet » va viet, hoa viet, san viet
co viet » so viet, o viet, hoc viet
cam tu » cam thu, nam tu, dam tu
tu may » tu ma, ty may, tu cay

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 ty) or (sach y)) lang xa hoi. hieu van cam tu may tinh va ((ca viet) or (co viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) lang xa hoi. hieu van cam tu may tinh va ((ca viet) OR (co viet)).
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach y)) lang xa hoi. hieu van cam tu may tinh va ((ca viet) or (co viet))*.