Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
hieu ve » hieu va, hieu van
sang xa » song xa, lang xa, sang ma
ky sang » ky nang, ky dang, ky tang
su sach » so sach, vu sach
va dan » ca dan, va dao, va dau
dan de » dan den, dang de, van de
de cua » le cua, te cua, dieu cua
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: ((thu sach) or (su sach)) ky sang xa hoi. ((hieu ve) or (thien van)) pham duc va dan de cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (su sach)) ky sang xa hoi. ((hieu ve) OR (thien van)) pham duc va dan de cua te.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) ky sang xa hoi. ((hieu ve) or (thien van)) pham duc va dan de cua te*.