Perhaps you should try some spelling variations:
thien van » thi van
cac tren » ca tren, cau tren, rac tren
thu sach » thuat sach, thuoc sach, thu hoach
tinh hai » tinh thai, tinh chat, trinh han
hai cac » khai cac, tai cac, hai cuc
tu sach » su sach, te sach, tu cach
van lam » van nam
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
x hoi » xa hoi, o hoi, x ho

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) or (thu sach)) ky nang x hoi. thien van lam ((xuc va) OR (tuc va)) tinh hai cac tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang x hoi. thien van lam ((xuc va) OR (tuc va)) tinh hai cac tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang x hoi. thien van lam ((xuc va) OR (tuc va)) tinh hai cac tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang x hoi. thien van lam ((xuc va) OR (tuc va)) tinh hai cac tren*.