Perhaps you should try some spelling variations:
luoc van » luoc can, luoc va, luot van
sach ty » sach y, sach thu, xach tay
luc van » luu van, duc van, luc va
qua cam » qua cham, qua cac, qua ca
nang ma » tang ma, sang ma, nang cao
sach tu » sach thu, cach tu, sach uu
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
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 ty) or (sach tu)) nang ma hoi. hieu qua cam ((luc van) OR (luoc van)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach tu)) nang ma hoi. hieu qua cam ((luc van) OR (luoc van)) hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (sach tu)) nang ma hoi. hieu qua cam ((luc van) OR (luoc van)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sach tu)) nang ma hoi. hieu qua cam ((luc van) OR (luoc van)) hanh vi cua tre*.