Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hanh tai » thanh tai, hang tai, han tai
hieu van » hieu va, thien van, lieu va
thu sach » thuat sach, thuoc sach, thu hoach
nang ma » tang ma, sang ma, nang cao
van cam » van nam, van lam, van cau
tu sach » su sach, te sach, tu cach
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » duc va, tuc va, luc va

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 ma hoi. hieu van cam xuc va ((hanh tai) or (hanh vi)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang ma hoi. hieu van cam xuc va ((hanh tai) OR (hanh vi)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky nang ma hoi. hieu van cam xuc va ((hanh tai) or (hanh vi)) cau tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ky nang ma hoi. hieu van cam xuc va ((hanh tai) or (hanh vi)) cau tren*.