Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, thanh san
nang tai » hang tai, tang tai, nang cao
sang tai » hang tai, sang tao, tang tai
su sach » so sach, vu sach
cam loc » cam lo
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
loc va » hoc va, luc va

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 y ((nang tai) or (sang tai)) roi. hieu ve cam loc va ((thanh tai) OR (doanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang tai) OR (sang tai)) roi. hieu ve cam loc va ((thanh tai) OR (doanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang tai) or (sang tai)) roi. hieu ve cam loc va ((thanh tai) OR (doanh tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang tai) or (sang tai)) roi. hieu ve cam loc va ((thanh tai) OR (doanh tai)) cua tre*.