Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, hinh tai
lang van » dang van, tang van, hoang van
tham luc » than luc, tham nuoc, tham thuc
cuu tre » cua tre, cau tren, cau treo
han tai » hang tai, nhan tai, van tai
va tham » van tham, va cham, va thanh
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc 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 tham luc va ((hanh tai) or (han tai)) cuu 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 tham luc va ((hanh tai) OR (han tai)) cuu 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 tham luc va ((hanh tai) or (han tai)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sac ky ((lang xa) OR (lang van)) hoi. hieu va tham luc va ((hanh tai) or (han tai)) cuu tre*.