Perhaps you should try some spelling variations:
thuat lanh » thuat lap, thuat san
sach hieu » sach thieu, sach tien, manh hieu
nham chai » nam chi, ham chau, ham khai
nam cham » nang cham, nam chi, nam cao
tu sach » thu sach, su sach, te sach
hieu bo » hieu so, thieu so
bo hoa » bao hoa, boi hoa, bo khoa

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 hieu bo hoa hoc ) or ( thuat lanh ((nham chai) OR (nam cham)) khoa hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach hieu bo hoa hoc ) OR ( thuat lanh ((nham chai) OR (nam cham)) khoa hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu sach hieu bo hoa hoc ) or ( thuat lanh ((nham chai) OR (nam cham)) khoa hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( tu sach hieu bo hoa hoc ) or ( thuat lanh ((nham chai) OR (nam cham)) khoa hoc ))*.