Perhaps you should try some spelling variations:
hanh tri » thanh tri, hanh tai, hanh trinh
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
te sach » toc sach
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, duc va
te sac » te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sac) OR (te sach)) ky lang xa hoi. hieu va cam ((tuc va) or (tuc xa)) hanh tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te sach)) ky lang xa hoi. hieu va cam ((tuc va) OR (tuc xa)) hanh tri cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) OR (te sach)) ky lang xa hoi. hieu va cam ((tuc va) or (tuc xa)) hanh tri cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sac) OR (te sach)) ky lang xa hoi. hieu va cam ((tuc va) or (tuc xa)) hanh tri cua tre*.