Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
chat truc » cau truc, chat xuc
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
van chat » cao chat
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
danh di » danh du, xanh di, danh dien
cua tre » cua te, cuu tre, dua tren
san ky » sang ky, van ky, dan ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat san ky ((nang xa) or (nang ma)) hoi. hieu van chat truc va danh di ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat san ky ((nang xa) OR (nang ma)) hoi. hieu van chat truc va danh di ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat san ky ((nang xa) or (nang ma)) hoi. hieu van chat truc va danh di ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: thuat san ky ((nang xa) or (nang ma)) hoi. hieu van chat truc va danh di ((cua tre) OR (cua triet))*.