Perhaps you should try some spelling variations:
tinh van » trinh van, dinh van, tinh va
cau tren » cu tren, dau tren, ca tren
sach lo » sach dao, sach doi, sach hoi
hieu ve » hieu va, hieu van
sach ly » sach y, sach ty, sach hay
cac luc » cau luc, coc luc, cac nuoc
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
hang x » nang x, hoang xa, chang xu
luc va » duc va, tuc va, loc va
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc ((sach ly) OR (sach lo)) hang x ho. hieu ve cac luc va tinh van ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc ((sach ly) OR (sach lo)) hang x ho. hieu ve cac luc va tinh van ((cua tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc ((sach ly) OR (sach lo)) hang x ho. hieu ve cac luc va tinh van ((cua tre) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: thuoc ((sach ly) OR (sach lo)) hang x ho. hieu ve cac luc va tinh van ((cua tre) or (cau tren))*.