Perhaps you should try some spelling variations:
nang cai » nang cao, nang tai, nang cap
tham duc » pham duc, tham du, than duc
va thanh » gia thanh, ban thanh, va tinh
thai cua » than cua, tri cua, dai cua
cai hoi » cau hoi, dai hoi, cai hoa
hieu va » lieu va
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky

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