Perhaps you should try some spelling variations:
tham thuc » nham thuc, tam thuc, thai thuc
hanh vinh » thanh vinh, khanh vinh, hanh tinh
pham thuc » phap thuc, pham chuc, nham thuc
vinh cuu » dinh cuu, sinh cua, dinh cu
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
sai ky » sac ky
ma hoi » mai hoi, ma hoa, me hoi
tu sai » tu bai, tu san, tu cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky nang ((ma hoi) OR (xa hoi)). hieu van ((tham thuc) or (pham thuc)) va hanh vinh cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky nang ((ma hoi) OR (xa hoi)). hieu van ((tham thuc) OR (pham thuc)) va hanh vinh cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky nang ((ma hoi) OR (xa hoi)). hieu van ((tham thuc) or (pham thuc)) va hanh vinh cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sai ky nang ((ma hoi) OR (xa hoi)). hieu van ((tham thuc) or (pham thuc)) va hanh vinh cuu tre*.