Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
lang van » dang van, tang van, hoang van
hieu van » hieu va, thien van, lieu va
su sach » vu sach
tinh vi » trinh vi, tinh voi, tinh va
thuc va » thuc vat, thuc day
van coc » van hoc, van loc, van co
ky lang » ky nang, ky dang, ky tang
so sach » so sanh, bo sach, co sach
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (so sach)) ky lang van hoa. hieu van coc ((thuc va) OR (thuc dan)) tinh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky lang van hoa. hieu van coc ((thuc va) OR (thuc dan)) tinh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ky lang van hoa. hieu van coc ((thuc va) OR (thuc dan)) tinh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky lang van hoa. hieu van coc ((thuc va) OR (thuc dan)) tinh vi cuu tre*.