Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
tu sach » thu sach, su sach, te sach
cua tre » cua te, cua triet, dua tren
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
cuu tre » cau tren, cau treo
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
xuc va » duc va, tuc va, luc va
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach thue ((nang xa) or (nang ma)) hoi. hieu ve cac xuc va dan vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thue ((nang xa) OR (nang ma)) hoi. hieu ve cac xuc va dan vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: tu sach thue ((nang xa) or (nang ma)) hoi. hieu ve cac xuc va dan vi ((cua tre) or (cuu tre))*.