Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
van lam » van nam
lam duc » lam duoc, pham duc, nam duoc
vai cua » dai cua, hai cua, lai cua
su sac » su sach, su xac
su cac » tu cac, su cao, su can

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) OR (su cac)) ky lang xa hoi. hieu van lam duc va thanh ((vai cua) or (tai cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su cac)) ky lang xa hoi. hieu van lam duc va thanh ((vai cua) OR (tai cuc)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) OR (su cac)) ky lang xa hoi. hieu van lam duc va thanh ((vai cua) or (tai cuc)) tre".
• Adding a wildcard symbol may retrieve word variants: ((su sac) OR (su cac)) ky lang xa hoi. hieu van lam duc va thanh ((vai cua) or (tai cuc)) tre*.