Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
hoc viet » hoc hien
mai viet » thi viet
nang mai » nang ma, nang tai, lang mai
hieu van » hieu va, thien van, lieu va
nam thuc » am thuc, nam thu, nam tu
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
mai hoi » mai khoi, dai hoi, lai hoi
ty nang » ky nang, ty xang, ty hang

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 ty nang mai hoi. hieu van ((nam thuc) or (nam thuoc)) va hanh vi ((mai viet) or (hoc viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang mai hoi. hieu van ((nam thuc) OR (nam thuoc)) va hanh vi ((mai viet) OR (hoc viet)).
• Adding a wildcard symbol may retrieve word variants: su sach ty nang mai hoi. hieu van ((nam thuc) or (nam thuoc)) va hanh vi ((mai viet) or (hoc viet))*.