Perhaps you should try some spelling variations:
lam thuoc » nam thuoc, am thuc, cay thuoc
tinh dam » tinh nam, tinh da, tinh dau
thi hanh » thi thanh
cam truc » cau truc, nam truc, lam truoc
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
hanh xa » hanh va, hanh ma, hanh xu
hieu va » lieu va, hieu qua
va tinh » may tinh
dam va » dam van, nam va, dam ha
thiet » thieu

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)) thi hanh xa hoi. hieu va ((cam truc) or (lam thuoc)) va tinh dam va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) thi hanh xa hoi. hieu va ((cam truc) OR (lam thuoc)) va tinh dam va thiet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) thi hanh xa hoi. hieu va ((cam truc) or (lam thuoc)) va tinh dam va thiet*.