Perhaps you should try some spelling variations:
dung trung » dung trong, quang trung, dung ung
tinh lap » trinh lap, tinh lao, dinh lap
cau tren » cu tren, dau tren, ca tren
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
va tinh » may tinh
ma hoi » mai hoi, xa hoi, ma hoa
hieu v » hieu va, hieu ve, hieu 2
v pham » vi pham, d pham

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang ma hoi. hieu v pham duc va tinh lap ((dung trung) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ma hoi. hieu v pham duc va tinh lap ((dung trung) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ma hoi. hieu v pham duc va tinh lap ((dung trung) or (cau tren))*.