Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
truc ban » thuc ban, truc dan, truc van
sach ty » sach y, sach tu, sach thu
hanh di » hanh vi, hanh de, hang di
su sach » so sach, vu sach
cuu tre » cua tre, cau tren, cau treo
ty nang » ky nang, ty xang, ty hang
va dau » va dao
di cuu » di cau, di cua, dinh cuu
x hoi » o hoi, x ho, 5 hoi

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 ty nang ((x hoi) OR (xa hoi)). lieu va dau ((truc ban) or (thuc dan)) hanh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ((x hoi) OR (xa hoi)). lieu va dau ((truc ban) OR (thuc dan)) hanh di cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ((x hoi) OR (xa hoi)). lieu va dau ((truc ban) or (thuc dan)) hanh di cuu tre*".