Perhaps you should try some spelling variations:
tang mai » tang ma, tang tai, lang mai
quoc ban » quoc bao, quoc lan, quoc quan
hoc quan » hoc dan, tac quan, hoc phan
hanh tai » thanh tai, hang tai, han tai
ky tang » ky nang, ky dang, kho tang
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
tai cua » thai cua, tai cuc, tri cua
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky tang mai hoi. hieu va phat ((quoc ban) or (hoc quan)) hanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky tang mai hoi. hieu va phat ((quoc ban) OR (hoc quan)) hanh tai cua te.
• Adding a wildcard symbol may retrieve word variants: tu sac ky tang mai hoi. hieu va phat ((quoc ban) or (hoc quan)) hanh tai cua te*.