Perhaps you should try some spelling variations:
trinh doc » trinh do, trinh hoa, trinh co
dinh doc » dinh duc, dinh ngoc, dinh so
vu sach » vu bach, su sach, vu khach
ly lang » ly vang, le lang, ly lanh
ly hang » ly quang
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
tuc van » thuc van, truc van, tuc va
va cam » va cham, va cac, va cao
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) or (ly hang)) xa hoi. hieu va cam tuc van ((dinh doc) OR (trinh doc)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ly lang) OR (ly hang)) xa hoi. hieu va cam tuc van ((dinh doc) OR (trinh doc)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((ly lang) or (ly hang)) xa hoi. hieu va cam tuc van ((dinh doc) OR (trinh doc)) cua te".
• Adding a wildcard symbol may retrieve word variants: vu sach ((ly lang) or (ly hang)) xa hoi. hieu va cam tuc van ((dinh doc) OR (trinh doc)) cua te*.