Perhaps you should try some spelling variations:
luoc can » luc canh, hoc can, luoc dai
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam
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: te ((sach ky) OR (sac ky)) nang xa hoi. hieu ve cam ((duc van) or (luoc can)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sac ky)) nang xa hoi. hieu ve cam ((duc van) OR (luoc can)) hanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sac ky)) nang xa hoi. hieu ve cam ((duc van) or (luoc can)) hanh vi cua tre*".