Perhaps you should try some spelling variations:
tuan tai » toan tai, quan tai, tuan tuoi
duc manh » suc manh, duc anh, duc minh
cac duc » cac du, cao duc, cac dac
tan tai » toan tai, tang tai, van tai
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach ty, sach kem
hieu ve » hieu va, hieu van
nang ho » nang hoc, nang co, tang ho
ho hoi » hoc hoi, hoa hoi, hoi hoi
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) or (sach y)) nang ho hoi. hieu ve cac duc manh ((tuan tai) OR (tan tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) nang ho hoi. hieu ve cac duc manh ((tuan tai) OR (tan tai)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sach y)) nang ho hoi. hieu ve cac duc manh ((tuan tai) OR (tan tai)) cua tre*".