Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
thanh lap » thanh san, phan lap, thanh hai
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
cua viet » ca viet, cua vat, cua dieu
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
cac day » cac dan, cac dai, cac 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 thue) or (sach y)) nang xa hoi. hieu van cac day va thanh lap ((cua viet) OR (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thue) OR (sach y)) nang xa hoi. hieu van cac day va thanh lap ((cua viet) OR (hoa viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thue) or (sach y)) nang xa hoi. hieu van cac day va thanh lap ((cua viet) OR (hoa viet))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thue) or (sach y)) nang xa hoi. hieu van cac day va thanh lap ((cua viet) OR (hoa viet))*.