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 va, hanh tai, hanh van
sac kho » suc khoe, cac khoi, dac khoa
tang ma » mang may, tang van
van cac » van hac, van cau, van bac
cac dat » cac dan, cai dat, cac dai
dat ban » bat ban, da ban, day ban
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 ((hanh vai) OR (hanh vi)) 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 ((hanh vai) OR (hanh vi)) cua vat".
• Adding a wildcard symbol may retrieve word variants: thuat sac kho tang ma hoi. hieu van cac dat ban ((hanh vai) OR (hanh vi)) cua vat*.