Perhaps you should try some spelling variations:
thuat sac » thuat sach, thuat san, thuat tac
kho tang » cao tang
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
sac kho » suc khoe, cac khoi, dac khoa
tang ma » mang may, tang van
van cac » van hac, van cau, van bac
dat ban » bat ban, da ban, nhat ban
day ban » tay ban, da ban, day dan
vai cua » dai cua, hai cua, lai cua
ma hoi » mai hoi, xa hoi, ma hoa

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 kho tang ma hoi. hieu van cac ((dat ban) OR (day ban)) hanh vai cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sac kho tang ma hoi. hieu van cac ((dat ban) OR (day ban)) hanh vai cua vat".
• Adding a wildcard symbol may retrieve word variants: thuat sac kho tang ma hoi. hieu van cac ((dat ban) OR (day ban)) hanh vai cua vat*.