Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
lam ngoc » pham ngoc, lam nguoi, lang ngoc
va thanh » gia thanh, ban thanh, va tinh
than cua » nhan cua, thai cua, ban cua
ky lang » ky dang, ky tang, tay lang
van lam » van nam
ngoc va » nuoc va, ngoc ha, goc va
vai cua » dai cua, hai cua, lai cua
su xac » pu xac, su cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su xac ((ky lang) OR (ky nang)) xa hoi. hieu van lam ngoc va thanh ((vai cua) or (than cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ((ky lang) OR (ky nang)) xa hoi. hieu van lam ngoc va thanh ((vai cua) OR (than cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ((ky lang) OR (ky nang)) xa hoi. hieu van lam ngoc va thanh ((vai cua) or (than cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su xac ((ky lang) OR (ky nang)) xa hoi. hieu van lam ngoc va thanh ((vai cua) or (than cua)) tre*.