Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, anh thai
hanh tai » thanh tai, hang tai, han tai
sach ky » sac ky, sach ty, sach kem
duc van » duc va, duc tan, duc manh
cac duc » cac du, cao duc, cac dac
hieu va » lieu va, hieu qua
nang ho » nang hoc, nang co, tang ho
cua tre » cua te, cuu tre, cua triet
ho hoi » hoc hoi, hoa hoi, hoi hoi

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 va cac duc van ((hanh thai) OR (hanh 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 va cac duc van ((hanh thai) OR (hanh 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 va cac duc van ((hanh thai) OR (hanh tai)) cua tre*".