Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
va thanh » gia thanh, ban thanh, va tinh
cham duc » pham duc, cham soc, pham duy
hieu va » lieu va, hieu qua
lap cua » lai cua, tap cua, lam cua
cua tre » cua te, cuu tre, cua triet
sach ty » sach tu, sach thu, xach tay
hieu vu » hieu ve, hieu su, dieu vu
tang ma » mang may, tang van
ma hoi » mai hoi, xa hoi, ma hoa

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

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