Perhaps you should try some spelling variations:
phap trinh » phap tinh, lap trinh, phap sinh
lam thuoc » nam thuoc, cay thuoc, nam thuc
trinh va » trinh van, trinh vat, trinh ve
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
sac ky » cac ky, sai ky
va cua » va chua, via cua, ca cua
tu sac » tu sach, tu cac, tu san

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

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