Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
phap thuc » phap thu, phap hoc, phap tu
van hanh » van thanh, ban hanh, van anh
nham thu » nham thuc, nam thu, pham thu
hieu van » hieu va, thien van, lieu va
cuu tre » cua tre, cau tren, cau treo
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
sai ky » sac ky
ma hoi » mai hoi, xa hoi, ma hoa
vi cuu » vi luu, vinh cuu
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 sang ma hoi. hieu van ((tham thuc) or (((phap thuc) or (nham thu)))) van hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky sang ma hoi. hieu van ((tham thuc) OR (((phap thuc) OR (nham thu)))) van hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sai ky sang ma hoi. hieu van ((tham thuc) or (((phap thuc) or (nham thu)))) van hanh vi cuu tre*.