Perhaps you should try some spelling variations:
tinh lap » trinh lap, tinh lao, dinh lap
kham duc » pham duc, kham cuoc, pham duy
su sach » vu sach
cuu tre » cua tre, cau tren, cau treo
va tinh » may tinh
vu kham » vu khanh
hieu vu » hieu va, hieu ve, hieu su
tang ma » mang may, tang van
ty tang » tay tang, ty xang, ty hang
so sach » so sanh, bo sach, co sach
tu tren » tu truyen, tu tieng, tu trong
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: ((su sach) OR (so sach)) ty tang ma hoi. hieu vu kham duc va tinh lap ((cuu tre) or (tu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ty tang ma hoi. hieu vu kham duc va tinh lap ((cuu tre) OR (tu tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ty tang ma hoi. hieu vu kham duc va tinh lap ((cuu tre) or (tu tren))".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ty tang ma hoi. hieu vu kham duc va tinh lap ((cuu tre) or (tu tren))*.