Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
hoa hoi » khoa hoi, hoa hoc, hoa doi
hieu va » lieu va, hieu qua
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
te cac » tu cac, ve cac, te cao
doc va » duoc va, hoc va, loc va
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te cac ((ky lang) OR (ky tang)) hoa hoi. hieu va thanh ((doc va) or (duc va)) hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ((ky lang) OR (ky tang)) hoa hoi. hieu va thanh ((doc va) OR (duc va)) hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cac ((ky lang) OR (ky tang)) hoa hoi. hieu va thanh ((doc va) or (duc va)) hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: te cac ((ky lang) OR (ky tang)) hoa hoi. hieu va thanh ((doc va) or (duc va)) hanh di cua tre*.