Perhaps you should try some spelling variations:
hanh tri » thanh tri, hanh tai, hanh trinh
lang van » dang van, tang van, hoang van
cua tre » cua te, cuu tre, cua triet
truc va » thuc va, thuc vat, trung va
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
loc va » hoc va, luc va
te sac » te sach, 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 ky ((lang xa) OR (lang van)) hoi. hieu va cam ((truc va) or (loc va)) hanh tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((lang xa) OR (lang van)) hoi. hieu va cam ((truc va) OR (loc va)) hanh tri cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky ((lang xa) OR (lang van)) hoi. hieu va cam ((truc va) or (loc va)) hanh tri cua tre".
• Adding a wildcard symbol may retrieve word variants: te sac ky ((lang xa) OR (lang van)) hoi. hieu va cam ((truc va) or (loc va)) hanh tri cua tre*.