Perhaps you should try some spelling variations:
thien van » thi van
tru nang » tra nang, tri nang, truc nano
hieu van » hieu va, lieu va, hieu ve
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
tu lang » cu lang, tu lanh, xu lang
xuc van » duc van, luc van, vuc van
hanh va » hang va, hanh vi
va cau » van cau, va cac, va dau

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 ((tu lang) or (tru nang)) xa hoi. ((hieu van) or (thien van)) cam xuc van hanh va cau tao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tu lang) OR (tru nang)) xa hoi. ((hieu van) OR (thien van)) cam xuc van hanh va cau tao.
• Adding a wildcard symbol may retrieve word variants: te sach ((tu lang) or (tru nang)) xa hoi. ((hieu van) or (thien van)) cam xuc van hanh va cau tao*.