Perhaps you should try some spelling variations:
tan thanh » tran thanh, tang thanh, toan thanh
thanh tai » thanh hai, thanh toan, doanh tai
cham duc » pham duc, cham soc, pham duy
nang dau » hang dau, xang dau, nang du
cua tre » cua te, cua triet, dua tren
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
dau hoi » cau hoi, dai hoi, dan hoi
sach ty » sach tu, sach thu, xach tay
cuu tre » cau tren, cau treo

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) or (sach ty)) nang dau hoi. hieu ve cham duc tan thanh tai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach y) OR (sach ty)) nang dau hoi. hieu ve cham duc tan thanh tai ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: su ((sach y) or (sach ty)) nang dau hoi. hieu ve cham duc tan thanh tai ((cua tre) or (cuu tre))*.