Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
hau truc » cau truc, hang truc, hoc truc
ky danh » ky anh
ky dang » ky nang
van hau » van ha, van hai, van dau
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
tai cua » thai cua, tai cuc, dai cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ((ky danh) OR (ky dang)) xa hoi. hieu van hau truc va hanh ((tai cua) or (tri cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((ky danh) OR (ky dang)) xa hoi. hieu van hau truc va hanh ((tai cua) OR (tri cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((ky danh) OR (ky dang)) xa hoi. hieu van hau truc va hanh ((tai cua) or (tri cua)) te".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((ky danh) OR (ky dang)) xa hoi. hieu van hau truc va hanh ((tai cua) or (tri cua)) te*.