Perhaps you should try some spelling variations:
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
tu sach » thu sach, te sach, tu cach
vu sach » vu bach, vu khach
su sach » so sach
la tren » loai tren, dua tren, dat tren
ve cac » va cac, vien cac
xuc va » duc va, tuc va, luc va
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
x hoi » xa hoi, o hoi, x ho
vi la » vi lua, vi ha, gi la

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 (((su sach) OR (vu sach)))) ky nang x hoi. hieu ve cac xuc va dan vi la tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (((su sach) OR (vu sach)))) ky nang x hoi. hieu ve cac xuc va dan vi la tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (((su sach) OR (vu sach)))) ky nang x hoi. hieu ve cac xuc va dan vi la tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (((su sach) OR (vu sach)))) ky nang x hoi. hieu ve cac xuc va dan vi la tren*.