Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va trien » va truyen, va thiet, va tuyen
tu cach » tu cac
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
luc va » tuc va, loc va
vi va » vi van, vai va, vu 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 cach) or (thu sach)) ky lang xa hoi. hieu va cam ((luc va) or (duc va)) hanh vi va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thu sach)) ky lang xa hoi. hieu va cam ((luc va) OR (duc va)) hanh vi va trien.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) ky lang xa hoi. hieu va cam ((luc va) or (duc va)) hanh vi va trien*.