Perhaps you should try some spelling variations:
hanh tri » thanh tri, hanh tai, hanh trinh
dang xay » dang van, van xay
cuu tre » cua tre, cau tren, cau treo
tri cuu » tri cua, tra cuu, trinh cuu
hieu va » lieu va, hieu qua
lang xa » lang ha, lang van
sai ky » sac ky
tuc va » thuc va, truc va, tuc xa
loc va » hoc va, luc va
te sai » te tai, te bai, te lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sai ky ((lang xa) or (dang xay)) hoi. hieu va cac ((tuc va) or (loc va)) hanh tri cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sai ky ((lang xa) OR (dang xay)) hoi. hieu va cac ((tuc va) OR (loc va)) hanh tri cuu tre.
• Adding a wildcard symbol may retrieve word variants: te sai ky ((lang xa) or (dang xay)) hoi. hieu va cac ((tuc va) or (loc va)) hanh tri cuu tre*.