Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
kham xuc » kham xung, kham cuoc, chat xuc
nang xa » nang x, lang xa, nang ma
hieu vu » hieu va, hieu ve, hieu su
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di 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) or (thu hoach)) ky nang xa hoi. hieu vu ((kham xuc) OR (cam xuc)) va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (thu hoach)) ky nang xa hoi. hieu vu ((kham xuc) OR (cam xuc)) va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) or (thu hoach)) ky nang xa hoi. hieu vu ((kham xuc) OR (cam xuc)) va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (thu hoach)) ky nang xa hoi. hieu vu ((kham xuc) OR (cam xuc)) va hanh vi cua tre*.