Perhaps you should try some spelling variations:
thien van » thi van
nam thuoc » nam thuc, nam thu, cay thuoc
nha thuoc » nha nuoc, nhan thuc, nha hoc
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
ty nang » ky nang, ty xang, ty hang
luu tre » luu tru, cuu tre, luy tre
vi luu » vi lua
x hoi » xa hoi, o hoi, x ho

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 ty nang x hoi. ((hieu va) or (thien van)) ((nam thuoc) or (nha thuoc)) va hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x hoi. ((hieu va) OR (thien van)) ((nam thuoc) OR (nha thuoc)) va hanh vi luu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x hoi. ((hieu va) or (thien van)) ((nam thuoc) or (nha thuoc)) va hanh vi luu tre*.