Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
hanh tri » thanh tri, hanh tai, hanh trinh
sach tu » sach thu, sach ty, sach uu
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
ang xa » lang xa, mang xa, dang xay
va cam » va cham, va cac, va cao
luc va » duc va, tuc va, loc va

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 tu) or (((cach tu) OR (cach thuc)))) ang xa hoi. hieu va cam luc va hanh tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach tu) OR (((cach tu) OR (cach thuc)))) ang xa hoi. hieu va cam luc va hanh tri cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach tu) or (((cach tu) OR (cach thuc)))) ang xa hoi. hieu va cam luc va hanh tri cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach tu) or (((cach tu) OR (cach thuc)))) ang xa hoi. hieu va cam luc va hanh tri cua tre*.