Perhaps you should try some spelling variations:
thuat sac » thuat sach, thuat san, thuat tac
hieu van » hieu va, thien van, lieu va
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
van cac » van hac, van cau, van bac
day ban » da ban, day dan, day manh
tay ban » tai ban, tay bac, tao ban
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
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. hieu van cac ((day ban) OR (tay ban)) hanh vi cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sac ky tang ma hoi. hieu van cac ((day ban) OR (tay ban)) hanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: thuat sac ky tang ma hoi. hieu van cac ((day ban) OR (tay ban)) hanh vi cua vat*.