Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
vat thanh » dat thanh, gat thanh, tat thanh
su triet » su tien, ve triet
su viet » so viet
ky hang » ky nang, ly hang, ky dang
hoa hoi » khoa hoi, hoa doi, hoc hoi
hieu va » lieu va, hieu qua
thu vat » thuc vat, thu va, thuat vat
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
va nam » van nam, ha nam, va nay

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 hang ((hoa hoi) or (hoa hoc)). hieu va nam thu vat thanh vai ((su triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky hang ((hoa hoi) OR (hoa hoc)). hieu va nam thu vat thanh vai ((su triet) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: tu sac ky hang ((hoa hoi) or (hoa hoc)). hieu va nam thu vat thanh vai ((su triet) or (su viet))*.