Perhaps you should try some spelling variations:
tham thuc » tam thuc, thai thuc, thach thuc
pham thuc » phap thuc, pham chuc, pham thu
nham thuc » nhan thuc, nam thuc, nham thu
hieu van » hieu va, thien van, lieu va
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
tu sai » tu bai, tu san, tu cai
sai ky » sac ky
ma hoi » mai hoi, xa hoi, ma hoa
vi cuu » vi luu, vinh cuu

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