Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
va thanh » gia thanh, ban thanh, le thanh
va tinh » may tinh
cac xuc » cam xuc, cac nuoc, chat xuc
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va, hieu van
tu nano » truc nano
tu nang » tru nang, tu nong, tu lang
vi cau » va cau, ve cau, di cau
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ((tu nang) OR (tu nano)) xa hoi. hieu ve cac xuc ((va thanh) or (va tinh)) vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((tu nang) OR (tu nano)) xa hoi. hieu ve cac xuc ((va thanh) OR (va tinh)) vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((tu nang) OR (tu nano)) xa hoi. hieu ve cac xuc ((va thanh) or (va tinh)) vi cau tren".
• Adding a wildcard symbol may retrieve word variants: vu sach ((tu nang) OR (tu nano)) xa hoi. hieu ve cac xuc ((va thanh) or (va tinh)) vi cau tren*.