Perhaps you should try some spelling variations:
hoc sach » hoc cac, hoc anh
hanh vai » hanh vi, hanh va, hanh tai
cao duc » dao duc, cao suc, giao duc
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
vai cua » dai cua, hai cua, lai cua
hieu va » lieu va, hieu qua
cao xuc » cam xuc, cao suc, chat xuc
va hanh » van hanh, va thanh, va danh
ha hoi » hoa hoi, ha noi, xa hoi
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc sinh) or (hoc sach)) ky lang ha hoi. hieu va ((cao xuc) OR (cao duc)) va hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sinh) OR (hoc sach)) ky lang ha hoi. hieu va ((cao xuc) OR (cao duc)) va hanh vai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sinh) or (hoc sach)) ky lang ha hoi. hieu va ((cao xuc) OR (cao duc)) va hanh vai cua te*".