Perhaps you should try some spelling variations:
hanh tri » thanh tri, hanh tai, hanh trinh
cuu tre » cua tre, cau tren, cau treo
tri cuu » tri cua, tra cuu, trinh cuu
hieu va » lieu va, hieu qua
lang ha » long ha
lang xa » dang xay, lang van
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
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 ha)) hoi. hieu va cam ((tuc va) or (hoc va)) hanh tri cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((lang xa) OR (lang ha)) hoi. hieu va cam ((tuc va) OR (hoc va)) hanh tri cuu tre.
• Adding a wildcard symbol may retrieve word variants: te sac ky ((lang xa) or (lang ha)) hoi. hieu va cam ((tuc va) or (hoc va)) hanh tri cuu tre*.