Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, mang xa
nang du » nang tu, nang luc, nang doc
nang ma » tang ma, sang ma, nang cao
va nang » van nang, da nang, cam nang
truc va » thuc va, thuc vat, trung va
va cam » va cham, va cac, va cao
du cua » duy cua, dau cua, dum cua
va cai » va cac, va bai, va dai
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang xa) OR (nang ma)) hoi. hieu ((va cai) OR (va cam)) truc va nang du cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((nang xa) OR (nang ma)) hoi. hieu ((va cai) or (va cam)) truc va nang du cua te~".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang xa) OR (nang ma)) hoi. hieu ((va cai) or (va cam)) truc va nang du cua te*.