Perhaps you should try some spelling variations:
thanh dinh » thanh binh, thanh tinh, thanh vinh
thuc dan » thuc hanh, thuc vat
dinh cuu » dinh chi
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
cuu tre » cua tre, cau tren, cau treo
truc va » thuc va, thuc vat, trung va
van cam » van nam, van lam, van cau
dang ha » dong ha, dung ha, lang ha
y dang » ky dang, 2 dang, _ dang

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 y dang ha noi. hieu van cam ((truc va) or (((thuc dan) OR (hoc dan)))) thanh dinh cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y dang ha noi. hieu van cam ((truc va) OR (((thuc dan) OR (hoc dan)))) thanh dinh cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y dang ha noi. hieu van cam ((truc va) or (((thuc dan) OR (hoc dan)))) thanh dinh cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach y dang ha noi. hieu van cam ((truc va) or (((thuc dan) OR (hoc dan)))) thanh dinh cuu tre*.