Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
va thanh » ban thanh, va tinh, le thanh
tang van » dang van, hoang van, trong van
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
vu sach » vu bach, su sach, vu khach
van hoi » van hoa, van hoc, van hoe
ky tang » ky nang, ky dang, kho tang
van cua » vang cua, ban cua, dan cua
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (hoc sach)) ky tang van hoi. hieu va cam duc ((va thanh) OR (gia thanh)) van cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (hoc sach)) ky tang van hoi. hieu va cam duc ((va thanh) OR (gia thanh)) van cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (hoc sach)) ky tang van hoi. hieu va cam duc ((va thanh) OR (gia thanh)) van cua vat".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (hoc sach)) ky tang van hoi. hieu va cam duc ((va thanh) OR (gia thanh)) van cua vat*.