Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
su triet » su viet, su tien, ve triet
va thanh » gia thanh, ban thanh, va tinh
mai khoi » mai khoa, tai khoa, cac khoi
dai hoi » dai hoc, dai hai, dai moi
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
mai hoi » lai hoi, mai doi, mai hoa
te sach » toc sach
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
dai su » dai sua, dai so, dan su

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y nang ((((mai hoi) or (dai hoi))) or (mai khoi)). hieu va cam duc va thanh dai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((((mai hoi) OR (dai hoi))) OR (mai khoi)). hieu va cam duc va thanh dai su triet.
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((((mai hoi) or (dai hoi))) or (mai khoi)). hieu va cam duc va thanh dai su triet*.