Perhaps you should try some spelling variations:
nuoc tren » thuoc tren
duoc tren » thuoc tren, dung tren, dua tren
hang tai » hang va, dung tai
nang mai » nang ma, nang tai, lang mai
cac duc » cac du, cao duc, cac dac
va hang » van hang, va nang, va lang
su sach » so sach
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
vu sach » vu bach, vu khach
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: ((su sach) or (vu sach)) ky nang mai hoi. hieu ve cac duc va hang tai ((duoc tren) or (nuoc tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang mai hoi. hieu ve cac duc va hang tai ((duoc tren) OR (nuoc tren)).
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky nang mai hoi. hieu ve cac duc va hang tai ((duoc tren) or (nuoc tren))*.