Perhaps you should try some spelling variations:
danh vai » danh sai, danh va, doanh van
su sach » so sach, vu sach
ky sang » ky nang, ky dang, duy sang
vai cua » dai cua, hai cua, lai cua
ky tang » ky nang, ky dang, kho tang
lay lai » lay thai
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, duc va
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: su sach ((ky sang) or (ky tang)) lay lai. hieu ve cam ((tuc va) OR (tuc xa)) danh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky sang) OR (ky tang)) lay lai. hieu ve cam ((tuc va) OR (tuc xa)) danh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky sang) or (ky tang)) lay lai. hieu ve cam ((tuc va) OR (tuc xa)) danh vai cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky sang) or (ky tang)) lay lai. hieu ve cam ((tuc va) OR (tuc xa)) danh vai cua te*.