Perhaps you should try some spelling variations:
thieu bien » thieu nien, tieu bieu, hien bien
bien cam » bien ca, bien cac, bien tam
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
ve triet » va trien, su triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
xuc van » duc van, luc van, vuc van

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang cao hoi. thieu bien cam xuc van hanh tai ((ve triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang cao hoi. thieu bien cam xuc van hanh tai ((ve triet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang cao hoi. thieu bien cam xuc van hanh tai ((ve triet) or (va thiet))*.