Perhaps you should try some spelling variations:
tinh tri » dinh tri, minh tri, chinh tri
dat duoc » dat nuoc, da duoc, luat duoc
nam duoc » nam thuoc, da duoc, nam moc
cua tre » cua te, cuu tre, cua triet
va tinh » may tinh
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
sai ky » sac ky
te sai » te tai, te bai, te lai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sai ky ((nang ma) or (tang ma)) hoi. hieu qua ((nam duoc) or (dat duoc)) va tinh tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sai ky ((nang ma) OR (tang ma)) hoi. hieu qua ((nam duoc) OR (dat duoc)) va tinh tri cua tre.
• Adding a wildcard symbol may retrieve word variants: te sai ky ((nang ma) or (tang ma)) hoi. hieu qua ((nam duoc) or (dat duoc)) va tinh tri cua tre*.