Perhaps you should try some spelling variations:
thuat sac » thuat sach, thuat san, thuat tac
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
ky tang » ky nang, ky dang, kho tang
van cac » van hac, van cau, van bac
cac dat » cac dan, cai dat, cac dai
dat ban » bat ban, da ban, day ban
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, me hoi
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sac ky tang ((ma hoi) OR (ma hoa)). hieu van cac dat ban hanh vi cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sac ky tang ((ma hoi) OR (ma hoa)). hieu van cac dat ban hanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: thuat sac ky tang ((ma hoi) OR (ma hoa)). hieu van cac dat ban hanh vi cua vat*.