Perhaps you should try some spelling variations:
hanh diem » hanh dieu, thanh liem, chanh niem
te sach » toc sach
diem la » diem lam, diem a, diem ha
va hanh » van hanh, va thanh, va danh
cac thu » cach thuc, cac thoi
sach ty » sach y, sach tu, sach thu
la tren » loai tren, dua tren, dat tren
hieu va » lieu va, hieu qua
nang xa » lang xa, nang ma, mang xa
cac tu » cach tu, cac du, tac tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty ((nang xa) or (nang x)) hoi. hieu va ((cac tu) OR (cac thu)) va hanh diem la tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((nang xa) OR (nang x)) hoi. hieu va ((cac tu) OR (cac thu)) va hanh diem la tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((nang xa) or (nang x)) hoi. hieu va ((cac tu) OR (cac thu)) va hanh diem la tren".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((nang xa) or (nang x)) hoi. hieu va ((cac tu) OR (cac thu)) va hanh diem la tren*.