Perhaps you should try some spelling variations:
pham day » phap day, pham duy, pham xay
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
hieu va » hieu qua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ha hoi » hoa hoi, ha noi, xa hoi
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky lang ha hoi. ((hieu va) or (lieu va)) pham day va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky lang ha hoi. ((hieu va) OR (lieu va)) pham day va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sac ky lang ha hoi. ((hieu va) or (lieu va)) pham day va hanh vi cua tre*.