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

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) or (ky dang)) ((ha hoi) or (xa hoi)). hieu va pham duy va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ((ky lang) OR (ky dang)) ((ha hoi) OR (xa hoi)). hieu va pham duy va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sac ((ky lang) or (ky dang)) ((ha hoi) or (xa hoi)). hieu va pham duy va hanh vi cua tre*.