Perhaps you should try some spelling variations:
trinh doc » trinh do, trinh hoa, trinh co
dinh doc » dinh duc, dinh ngoc, dinh so
dang xay » dang van, van xay
vu sach » vu bach, su sach, vu khach
lang xa » lang ha, lang van
hieu va » lieu va, hieu qua
sach ly » sach y, sach lo, sach ty
cam tuc » cam xuc, cam tu, nam thuc
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ly ((lang xa) or (dang xay)) hoi. hieu va cam tuc va ((dinh doc) OR (trinh doc)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ly ((lang xa) OR (dang xay)) hoi. hieu va cam tuc va ((dinh doc) OR (trinh doc)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ly ((lang xa) or (dang xay)) hoi. hieu va cam tuc va ((dinh doc) OR (trinh doc)) cua te".
• Adding a wildcard symbol may retrieve word variants: vu sach ly ((lang xa) or (dang xay)) hoi. hieu va cam tuc va ((dinh doc) OR (trinh doc)) cua te*.