Perhaps you should try some spelling variations:
lieu van » lieu va, hieu van, sieu van
cau thuc » cau truc, cuu thuc, can thuc
dan hanh » dang hanh, dan khanh, dan thanh
sach thu » sach thue, sach thieu, sach tham
thuc dan » thuc hanh, hoc dan, thuc vat
cua tre » cuu tre, cua triet, dua tren
van cau » van dau, van hau, van chat
sach ty » sach y, sach tu, xach tay
xang xa » lang xa, mang xa, ang xa
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: su ((sach ty) or (sach thu)) xang xa hoi. lieu van cau thuc dan hanh vi ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach thu)) xang xa hoi. lieu van cau thuc dan hanh vi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) or (sach thu)) xang xa hoi. lieu van cau thuc dan hanh vi ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach thu)) xang xa hoi. lieu van cau thuc dan hanh vi ((cua tre) OR (cua te))*.