Perhaps you should try some spelling variations:
duoc tren » nuoc tren, thuoc tren, dung tren
lang tai » lang thai, hang tai, tang tai
duc tien » duc thien, luc tieng, thuc tien
vu sach » vu bach, su sach, vu khach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
va lang » va nang, hoa lang
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach y nang ma hoi. hieu ve pham duc va lang tai ((duc tien) or (duoc tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang ma hoi. hieu ve pham duc va lang tai ((duc tien) OR (duoc tren)).
• Adding a wildcard symbol may retrieve word variants: vu sach y nang ma hoi. hieu ve pham duc va lang tai ((duc tien) or (duoc tren))*.