Perhaps you should try some spelling variations:
kha nang » phap nang, ky nang, ki nang
thai cua » than cua, tai cuc, tri cua
sach kha » sach nha, sach ha, sach tham
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
thuc va » thuc dan, thuc day
ve nam » he nam, va nam, le nam
ma hoi » mai hoi, xa hoi, ma hoa
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach kha nang ma hoi. hieu ve nam ((thuc va) OR (thuc vat)) hanh ((di cua) or (thai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach kha nang ma hoi. hieu ve nam ((thuc va) OR (thuc vat)) hanh ((di cua) OR (thai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach kha nang ma hoi. hieu ve nam ((thuc va) OR (thuc vat)) hanh ((di cua) or (thai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: vu sach kha nang ma hoi. hieu ve nam ((thuc va) OR (thuc vat)) hanh ((di cua) or (thai cua)) triet*.